Physics Past Questions v24 for (JAMB/WAEC/NECO)

Physics Past Questions v24 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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#1. In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and that across the resistor is 6Vr.m.s. The effective voltage is

A) 2V

A) 2V

B) 10V

B) 10V

C) 14V

C) 14V

D) 48V

D) 48V

#2. The diagram above shows the prism arrangement in a

A) binocular

A) binocular

B) spectrometer

B) spectrometer

C) periscope

C) periscope

D) projector

D) projector

#3. The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are

A) North - North

A) North - North

B) North - South

B) North - South

C) South - North

C) South - North

D) South - South

D) South - South

#4. In the circuit above, the ammeter reads a current of 5.0 A when R = 8Ω and reads 7.0A when R = 5Ω. The value of the unknown resistance X is

A) 10.0Ω

A) 10.0Ω

B) 7.5Ω

B) 7.5Ω

C) 5.0Ω

C) 5.0Ω

D) 2.5Ω

D) 2.5Ω

#5. In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is

A) 3.0 x 104J

A) 3.0 x 104J

B) 3.0 x 102J

B) 3.0 x 102J

C) 2.5 x 10-2J

C) 2.5 x 10-2J

D) 6.0 x 10-3J

D) 6.0 x 10-3J

#6. In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P1 and P2 dissipated by R1 and R2

A) R2/R1

A) R2/R1

B) R1/R2

B) R1/R2

C) R1+R2/R1

C) R1+R2/R1

D) R1+R2/R2

D) R1+R2/R2

#7. The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W.

A) 13.3N

A) 13.3N

B) 20.0N

B) 20.0N

C) 40.0N

C) 40.0N

D) 80.0N

D) 80.0N

#8. The diagram above shows a solid figure with base PQ and center of gravity G on a inclined plane. Which of the following statements is correct

A) The solid will fall over if the vertical line through G lies outside the base

A) The solid will fall over if the vertical line through G lies outside the base

B) The solid will fall over if the vertical line through lies inside the base

B) The solid will fall over if the vertical line through lies inside the base

C) The solid will not fall over if the vertical line through G lies outside the base

C) The solid will not fall over if the vertical line through G lies outside the base

D) The solid can never fall over

D) The solid can never fall over

#9. The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston

A) both valves are open

A) both valves are open

B) P is open while Q is closed

B) P is open while Q is closed

C) P is closed while Q is open

C) P is closed while Q is open

D) Both valves are closed

D) Both valves are closed

#10. In the J-tube above, Y and X are on the same horizontal level and 30cm3 of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X

A) 15 cm3

A) 15 cm3

B) 25 cm3

B) 25 cm3

C) 35 cm3

C) 35 cm3

D) 45 cm3

D) 45 cm3

#11. The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 108ms-1. What is the frequency of the wave

A) 3.0 x 107Hz

A) 3.0 x 107Hz

B) 9.0 x 107Hz

B) 9.0 x 107Hz

C) 1.0 x 109Hz

C) 1.0 x 109Hz

D) 3.0 x 109Hz

D) 3.0 x 109Hz

#12. The diagram above shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are

A) 8.0 ms-2, 4,0 ms-2

A) 8.0 ms-2, 4,0 ms-2

B) 4.0 ms-2, 8.0 ms-2

B) 4.0 ms-2, 8.0 ms-2

C) 4.0 ms-2, 2.0 ms-2

C) 4.0 ms-2, 2.0 ms-2

D) 2.0 ms-2, 4.0 ms-2

D) 2.0 ms-2, 4.0 ms-2

#13. If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Pa is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

A) ∆x ∆Px ≥ h

A) ∆x ∆Px ≥ h

B) ∆x ∆Px = 0

B) ∆x ∆Px = 0

C) ∆x ∆Px< h

C) ∆x ∆Px< h

D) ∆x ∆Px = ∞

D) ∆x ∆Px = ∞

#14. A semiconductor diode is used in rectifying alternating current into direct current mainly because it

A) allows current to flow in either direction

A) allows current to flow in either direction

B) is non-linear

B) is non-linear

C) offers a high input resistance

C) offers a high input resistance

D) allows current to flow only in one direction

D) allows current to flow only in one direction

#15. if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as

A) ∆x ∆Px ≥ h

A) ∆x ∆Px ≥ h

B) ∆x ∆Px = 0

B) ∆x ∆Px = 0

C) ∆x ∆Px< h

C) ∆x ∆Px< h

D) ∆x ∆Px = ∞

D) ∆x ∆Px = ∞

#16. Gamma rays are produced when

A) high velocity electrons are abruptly stopped in metals

A) high velocity electrons are abruptly stopped in metals

B) energy changes occur within the nucleus of atoms

B) energy changes occur within the nucleus of atoms

C) energy changes occur within the electronic structure of atoms

C) energy changes occur within the electronic structure of atoms

D) electrons are deflected in very strong magnetic fields

D) electrons are deflected in very strong magnetic fields

#17. What is the speed of a particle of mass 10-27kg whose wavelength is 10-8m.[h = 6.63 x 10-34Js]

A) 6.63ms-1

A) 6.63ms-1

B) 66.30ms-1

B) 66.30ms-1

C) 663.00ms-1

C) 663.00ms-1

D) 6630.00ms-1

D) 6630.00ms-1

#18. in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

A) 30V

A) 30V

B) 40V

B) 40V

C) 50V

C) 50V

D) 70V

D) 70V

#19. In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

A) a gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume

A) a gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume

B) the gold nucleus is positively charged and is concentrated in a tiny volume

B) the gold nucleus is positively charged and is concentrated in a tiny volume

C) the gold nucleus emitted alpha particles

C) the gold nucleus emitted alpha particles

D) the gold nucleus is concentrated in a tiny volume and contains alpha particles

D) the gold nucleus is concentrated in a tiny volume and contains alpha particles

#20. 2311Na + Proton → pqX + alpha particle What are the values of p and q respectively in the equation above?

A) 10 and 20

A) 10 and 20

B) 12 and 24

B) 12 and 24

C) 20 and 10

C) 20 and 10

D) 24 and 12

D) 24 and 12

#21. A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

A) 2A

A) 2A

B) 5A

B) 5A

C) 10A

C) 10A

D) 20A

D) 20A

#22. A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?

A) 2mA

A) 2mA

B) 10mA

B) 10mA

C) 20mA

C) 20mA

D) 25mA

D) 25mA

#23. In fleming's right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the

A) motion, the field and the induced current

A) motion, the field and the induced current

B) induced current, the motion and the field

B) induced current, the motion and the field

C) field, the induced current and the motion

C) field, the induced current and the motion

D) induced current, the field and the motion

D) induced current, the field and the motion

#24. At what frequency would a 10H inductor have a reactance of 2000Ω?

A) π/200Hz

A) π/200Hz

B) π/100Hz

B) π/100Hz

C) 100/πHz

C) 100/πHz

D) 100πHz

D) 100πHz

#25. The core of an efficient transformer should consist of laminated pieces of metal in order to

A) increase the heat produced by increasing the eddy current

A) increase the heat produced by increasing the eddy current

B) increase the heat produced by reducing the eddy current

B) increase the heat produced by reducing the eddy current

C) reduce the heat produced by increasing the eddy current

C) reduce the heat produced by increasing the eddy current

D) reduce the heat produced by reducing the eddy current

D) reduce the heat produced by reducing the eddy current

#26. The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is

A) 0.33

A) 0.33

B) 0.50

B) 0.50

C) 0.67

C) 0.67

D) 0.75

D) 0.75

#27. An astronomical telescope is said to be in normal adjustment when the

A) eye is accommodated

A) eye is accommodated

B) focal length of objective lens is longer than that of eye piece

B) focal length of objective lens is longer than that of eye piece

C) final image is at the near point of eye

C) final image is at the near point of eye

D) final image is at infinity

D) final image is at infinity

#28. Which of the following electromagnetic waves is least energetic?

A) Infra-red rays

A) Infra-red rays

B) X-rays

B) X-rays

C) Ultra-violet rays

C) Ultra-violet rays

D) Gamma rays

D) Gamma rays

#29. Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

A) 6.0V, 16Ω

A) 6.0V, 16Ω

B) 6.0V, 1Ω

B) 6.0V, 1Ω

C) 1.5V, 4Ω

C) 1.5V, 4Ω

D) 1.5V, 1Ω

D) 1.5V, 1Ω

#30. The equation of a wave travelling along the positive x-direction is given by; Y = 0.25 x 10-3 sin (500t - 0.025x). Determine the angular frequency of the wave motion.

A) 0.25 x 10-3rad s-1

A) 0.25 x 10-3rad s-1

B) 0.25 x 10-1rad s-1

B) 0.25 x 10-1rad s-1

C) 5.00 x 102rad s-1

C) 5.00 x 102rad s-1

D) 2.50 x 103rad s-1

D) 2.50 x 103rad s-1

#31. If a sound wave goes from a cold air region to a hot air region, its wavelength will

A) increase

A) increase

B) decrease

B) decrease

C) decrease then increase

C) decrease then increase

D) remain constant

D) remain constant

#32. The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz?

A) 4

A) 4

B) 3

B) 3

C) 2

C) 2

D) 1

D) 1

#33. A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is

A) 3m

A) 3m

B) 5m

B) 5m

C) 6m

C) 6m

D) 10m

D) 10m

#34. The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

A) concave mirror of focal length 5cm

A) concave mirror of focal length 5cm

B) concave mirror of focal length 10cm

B) concave mirror of focal length 10cm

C) convex mirror of focal length 5cm

C) convex mirror of focal length 5cm

D) convex mirror of focal length 20cm

D) convex mirror of focal length 20cm

#35. A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A) P0/5

A) P0/5

B) 4P0/5

B) 4P0/5

C) P0

C) P0

D) 5P0

D) 5P0

#36. A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]

A) 2/9°C

A) 2/9°C

B) 4/9°C

B) 4/9°C

C) 9/4°C

C) 9/4°C

D) 9/2°C

D) 9/2°C

#37. I. A liquid boils when its saturated vapour pressure is equal to the external pressure II. Dissolved substances in pure water lead to increase in the boiling point. III. When the external pressure is increased, the boiling point increases. IV. Dissolved substances in pure water decrease the boiling point.Which combination of the above are peculiarities of the boiling point of a liquid?

A) I, II and III

A) I, II and III

B) I, II, III and IV

B) I, II, III and IV

C) I, II and IV

C) I, II and IV

D) II, III and IV

D) II, III and IV

#38. A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

A) 1 . 25 x 104 W

A) 1 . 25 x 104 W

B) 2 . 50 x 104 W

B) 2 . 50 x 104 W

C) 1 . 25 x 106W

C) 1 . 25 x 106W

D) 2 . 50 x 106 W

D) 2 . 50 x 106 W

#39. When the brakes in a car are applied, the frictional force force on the tyres is

A) is a disadvantage because it is in the direction of the motion of the car

A) is a disadvantage because it is in the direction of the motion of the car

B) is a disadvantage because it is in the opposite direction of the motion of the car

B) is a disadvantage because it is in the opposite direction of the motion of the car

C) is an advantage because it is in the direction of the motion of the car

C) is an advantage because it is in the direction of the motion of the car

D) is an advantage because it is in the opposite direction of the motion of the car

D) is an advantage because it is in the opposite direction of the motion of the car

#40. If the stress on a wire is 107NM-2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is

A) 5 . 0 x 104 Nm-2

A) 5 . 0 x 104 Nm-2

B) 5 . 0 x 105 Nm-2

B) 5 . 0 x 105 Nm-2

C) 2 . 0 x 108 Nm-2

C) 2 . 0 x 108 Nm-2

D) 2 . 0 x 109 Nm-2

D) 2 . 0 x 109 Nm-2

#41. A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

A) 5/3

A) 5/3

B) 4/3

B) 4/3

C) 3/4

C) 3/4

D) 7/10

D) 7/10

#42. When temperature of a liquid increases, its surface tension

A) Decreases

A) Decreases

B) Increases

B) Increases

C) Remain Constant

C) Remain Constant

D) Increases then decreases

D) Increases then decreases

#43. The inner diameter of a test tube can be measured accurately using a

A) micrometer screw guage

A) micrometer screw guage

B) pair of dividers

B) pair of dividers

C) metre rule

C) metre rule

D) pair of vernier calipers

D) pair of vernier calipers

#44. Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

A) 1 : 4

A) 1 : 4

B) 2 : 1

B) 2 : 1

C) 2 : 3

C) 2 : 3

D) 2 : 5

D) 2 : 5

#45. Particles of mass 10-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

A) 2 N

A) 2 N

B) 20 N

B) 20 N

C) 200 N

C) 200 N

D) 400 N

D) 400 N

#46. a lead bullet of mass 0.05kg is fired with a velocity of 200ms-1 into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is

A) 50 J

A) 50 J

B) 100 J

B) 100 J

C) 150 J

C) 150 J

D) 200 J

D) 200 J

#47. A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is(take g = 10ms-2)

A) 5 J

A) 5 J

B) 10 J

B) 10 J

C) 15 J

C) 15 J

D) 20 J

D) 20 J

#48. The amplitude of a wave is the

A) distance travelled by the wave in a complete cycle of its motion

A) distance travelled by the wave in a complete cycle of its motion

B) maximum diplacement of the wave particle from the equilibrum position

B) maximum diplacement of the wave particle from the equilibrum position

C) separation of two adjacent particles vibrating in a phase

C) separation of two adjacent particles vibrating in a phase

D) distance between two successive troughs of the wave

D) distance between two successive troughs of the wave

#49. Which of the following is not a safety precaution in a nuclear station?

A) Radioactive materials are stored in glass casings

A) Radioactive materials are stored in glass casings

B) Radioactive materials are handled with remote-controlled tongs

B) Radioactive materials are handled with remote-controlled tongs

C) Technicians in nuclear stations wear radio-sensitive badges which are checked regularly.

C) Technicians in nuclear stations wear radio-sensitive badges which are checked regularly.

D) Radioactive materials are kept in thick-walled lead containers

D) Radioactive materials are kept in thick-walled lead containers

#50. A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10-34Js; 1eV = 1.6 x 10-19J)

A) 2.01 X 1015Hz

A) 2.01 X 1015Hz

B) 1.06x1015Hz

B) 1.06x1015Hz

C) 6.30 x 1014Hz

C) 6.30 x 1014Hz

D) 1.60 x 1014Hz

D) 1.60 x 1014Hz

#51. he half-life of a radioactive substance is

A) its average life time

A) its average life time

B) one-half the value of its decay constant.

B) one-half the value of its decay constant.

C) the length of time needed by the substance to decay completely

C) the length of time needed by the substance to decay completely

D) the length of time during which the activity of the substance reduces by 50%.

D) the length of time during which the activity of the substance reduces by 50%.

#52. The half-life of a radioactive element is 5 Calculate its decay constant

A) 0.113s-1

A) 0.113s-1

B) 0.436 s-1

B) 0.436 s-1

C) 0.139 s-1

C) 0.139 s-1

D) 0.193 s-1.

D) 0.193 s-1.

#53. Which of the following are the essential parts of an atomic bomb?

A) Uranium and neutrons

A) Uranium and neutrons

B) Radium and polonium

B) Radium and polonium

C) Nitrogen and neutrons

C) Nitrogen and neutrons

D) ranium and α - particles.

D) ranium and α - particles.

#54. A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm-1 Calculate the work done on the charge

A) 5.0 x 106J

A) 5.0 x 106J

B) 1.0 x10-6J

B) 1.0 x10-6J

C) 5.0 x10-7J

C) 5.0 x10-7J

D) 1.0 x 10-2J

D) 1.0 x 10-2J

#55. Magnetic flux density is defined as the

A) total number of magnetic lines of force surrounding a magnet

A) total number of magnetic lines of force surrounding a magnet

B) number of magnetic lines of force per unit area normal to the magnetic field

B) number of magnetic lines of force per unit area normal to the magnetic field

C) strength of the magnetic field surrounding a current-carrying conductor

C) strength of the magnetic field surrounding a current-carrying conductor

D) magnetic force exerted on a unit magnetic pole

D) magnetic force exerted on a unit magnetic pole

#56. The voltage and current in the primary of a transformer are 200V and 2Arespectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.

A) 100%

A) 100%

B) 90%

B) 90%

C) 75%

C) 75%

D) 50%

D) 50%

#57. In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity

A) 20 N C-1

A) 20 N C-1

B) 8 N C-1

B) 8 N C-1

C) 5 N C-1

C) 5 N C-1

D) 2 N C-1

D) 2 N C-1

#58. A 10- Ω coil takes 21 s to melt 10g of ice at 0oC. Assuming no heat losses, determine the current in the coil. (Specific latent heat of fusion of ice = 336 Jg-1)

A) 16A

A) 16A

B) 5A

B) 5A

C) 4A

C) 4A

D) 3A

D) 3A

#59. If the position of resonance in a resonance tube is 16.50cm from open end of the tube, calculate the distance from the open end to the next position where resonance occurs. (Neglect end-correction)

A) 24.75cm

A) 24.75cm

B) 33.00cm

B) 33.00cm

C) 41.25cm

C) 41.25cm

D) 49.50cm

D) 49.50cm

#60. Thunder is usually heard some seconds after lightning is observed because

A) the human eye is more sensitive to light than the ear to sound

A) the human eye is more sensitive to light than the ear to sound

B) sound and light travel in different media

B) sound and light travel in different media

C) thunder occurs after lightning

C) thunder occurs after lightning

D) light travels faster than sound

D) light travels faster than sound

#61. Using the data on the diagram above, calculate the potential difference across the 20- Ω resistor. (Neglect the internal resistance of the cell)

A) 5V

A) 5V

B) 10V

B) 10V

C) 20V

C) 20V

D) 60V

D) 60V

#62. Using the diagram above, calculate the effective capacitance of the circuit

A) 1.56μf

A) 1.56μf

B) 3.00μF

B) 3.00μF

C) 3.71μF

C) 3.71μF

D) 9.00μF

D) 9.00μF

#63. The parts of a bar magnet at which the magnetic effect is strongest are called the

A) poles

A) poles

B) neutral points

B) neutral points

C) magnetic declinations

C) magnetic declinations

D) magnetic meridians

D) magnetic meridians

#64. The refractive index of glass for yellow light is greater than that for red light because yellow light

A) has a greater amplitude than red light

A) has a greater amplitude than red light

B) is more intense than red light

B) is more intense than red light

C) travels more slowly than red light

C) travels more slowly than red light

D) deviates less than red light

D) deviates less than red light

#65. The real image of an object formed by a converging lens of focal length 15cm, is three times the size of the object. Calculate the object distance

A) 60cm

A) 60cm

B) 30cm

B) 30cm

C) 20cm

C) 20cm

D) 15cm

D) 15cm

#66. Which of the following statements is not correct about long sight?

A) A Iong-sighted person can see distant objects clearly

A) A Iong-sighted person can see distant objects clearly

B) ight from a nearby object is focused behind the retina. .

B) ight from a nearby object is focused behind the retina. .

C) The eyeball is too short

C) The eyeball is too short

D) The defect is corrected by using a diverging lens

D) The defect is corrected by using a diverging lens

#67. ln order to obtain a sound note of a high pitch from a wire stretched by a constant tension, the wire must be

A) short and thick

A) short and thick

B) short and thin

B) short and thin

C) long and thick

C) long and thick

D) long and thin

D) long and thin

#68. Which of the following statements about evaporation is not correct?

A) The rate of evaporation of a liquid varies with temperature

A) The rate of evaporation of a liquid varies with temperature

B) The molecules of an evaporating liquid have an average speed

B) The molecules of an evaporating liquid have an average speed

C) Evaporation occurs when faster molecules escape from the surface of a liquid

C) Evaporation occurs when faster molecules escape from the surface of a liquid

D) Evaporation takes place inside a liquid.

D) Evaporation takes place inside a liquid.

#69. Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l-1K-1)

A) 1,050W

A) 1,050W

B) 16,800W

B) 16,800W

C) 18,060W

C) 18,060W

D) 20,160W

D) 20,160W

#70. A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is

A) 20o

A) 20o

B) 40o

B) 40o

C) 80o

C) 80o

D) 120o.

D) 120o.

#71. The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be

A) mechanical and transverse

A) mechanical and transverse

B) progressive and longitudinal

B) progressive and longitudinal

C) stationary and transverse

C) stationary and transverse

D) stationary and longitudinal.

D) stationary and longitudinal.

#72. The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror

A) 3.75cm

A) 3.75cm

B) 6.60cm

B) 6.60cm

C) 10.00cm

C) 10.00cm

D) 15.00cm

D) 15.00cm

#73. An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)

A) 50.006m

A) 50.006m

B) 50.060m

B) 50.060m

C) 51.600m

C) 51.600m

D) 51.200m

D) 51.200m

#74. The heat capacity of a substance is the energy

A) required to raise the temperature of a unit mass of the substance by one degree.

A) required to raise the temperature of a unit mass of the substance by one degree.

B) required to raise the temperature of the substance by one degree .

B) required to raise the temperature of the substance by one degree .

C) absorbed by the substance at constant temperature

C) absorbed by the substance at constant temperature

D) lost by a unit mass of the substance

D) lost by a unit mass of the substance

#75. The temperature of a piece of metal of mass 9 g is raised from 10oC to 110oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg-1K-1

A) 1.2

A) 1.2

B) 12.0

B) 12.0

C) 120.0

C) 120.0

D) 1200.0

D) 1200.0

#76. Which of the following statements is not correct?

A) A sea breeze is due to convection in air

A) A sea breeze is due to convection in air

B) Cotton materials are better than woollen ones for use in hot weather

B) Cotton materials are better than woollen ones for use in hot weather

C) Convectional currents play an important role in the cooling of the engine of a motor car

C) Convectional currents play an important role in the cooling of the engine of a motor car

D) The vacuum space in a flask helps to reduce heat loss by radiation.

D) The vacuum space in a flask helps to reduce heat loss by radiation.

#77. Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific heat capacity of water = 4200 J kg-1K-1) (Specific latent heat of fusion of ice = 336,000 J kg-1)

A) 75,600J

A) 75,600J

B) 336,000J

B) 336,000J

C) 340,200J

C) 340,200J

D) 378,000J.

D) 378,000J.

#78. A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram above. Calculate the value of the tension, T. (g = 10ms-2)

A) 300.0N

A) 300.0N

B) 173.2N

B) 173.2N

C) 30.0N

C) 30.0N

D) 17.3N

D) 17.3N

#79. A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.

A) 2.00s

A) 2.00s

B) 0.83s

B) 0.83s

C) 0.08s

C) 0.08s

D) 0.60s

D) 0.60s

#80. A trolley of mass 4kg moving on a smooth horizontal platform with a speed of 1.0ms-1 collides perfectly with a stationary trolley of the same mass on the same platform. Calculate the total momentum of the two trolleys immediately after the collision.

A) 0.5Ns

A) 0.5Ns

B) 1.0Ns

B) 1.0Ns

C) 4.0Ns

C) 4.0Ns

D) 8.0Ns

D) 8.0Ns

#81. The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is 90o. This thermometer reads 60o when the true temperature is 40oC Calculate the value of X.

A) 60o

A) 60o

B) 48o

B) 48o

C) 40o

C) 40o

D) 30o

D) 30o

#82. Iron at 30oC feels colder to the hand than wood at 28oC because

A) their linear expansivities are not equal.

A) their linear expansivities are not equal.

B) the temperature of the iron is higher than that of the wood

B) the temperature of the iron is higher than that of the wood

C) iron is a better radiator of heat than wood

C) iron is a better radiator of heat than wood

D) iron conducts heat more quickly from the hand than wood

D) iron conducts heat more quickly from the hand than wood

#83. A body weighing 10N moves with a speed of 5ms-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms-2)

A) 10N

A) 10N

B) 50N

B) 50N

C) 75N

C) 75N

D) 100N

D) 100N

#84. A motorcyclist, passing a road junction, moves due west for 8 s at a uniform speed of 5ms-1. He then moves due north for another 6 s with the same speed. At the end of the 6s his displacement from the road junction is 50m in the direction of

A) N53oE

A) N53oE

B) N37oE

B) N37oE

C) N53oW

C) N53oW

D) N37oW

D) N37oW

#85. The time rate of change of displacement is known as

A) speed

A) speed

B) velocity

B) velocity

C) impulse

C) impulse

D) acceleration

D) acceleration

#86. A stone of mass 0.7kg is projected vertically , upwards with a speed of 5ms-1. Calculate the maximum height reached. (Take g as 10ms-2 and neglect air resistance)

A) 1.00m

A) 1.00m

B) 1.25m

B) 1.25m

C) 1.50m

C) 1.50m

D) 3.75m

D) 3.75m

#87. If the force of attraction between the sun and the 1 planets is removed; the planets will

A) fall towards the sun

A) fall towards the sun

B) scatter and stop moving

B) scatter and stop moving

C) continue to move at tangent to their original orbits '

C) continue to move at tangent to their original orbits '

D) continue to move perpendicular to their original orbits.

D) continue to move perpendicular to their original orbits.

#88. The force between molecules of the same substance is termed

A) elastic force

A) elastic force

B) repulsive force

B) repulsive force

C) cohesive force

C) cohesive force

D) adhesive force

D) adhesive force

#89. A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.

A) 90ms-2

A) 90ms-2

B) 60ms-2

B) 60ms-2

C) 30ms-2

C) 30ms-2

D) 15ms-2.

D) 15ms-2.

#90. Palm oil from a bottle flows out more easily after it as been heated because the

A) molecules are given potential energy during the heating

A) molecules are given potential energy during the heating

B) friction between oil layers is reduced

B) friction between oil layers is reduced

C) oil molecules force each other out

C) oil molecules force each other out

D) adhesion between the oil molecules and those of the bottle is increased

D) adhesion between the oil molecules and those of the bottle is increased

#91. Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other. II The waves must have the same frequency. III. The waves must have the same amplitude. IV. The waves must travel with the speed of light.

A) I, II and III only

A) I, II and III only

B) I and II only

B) I and II only

C) II, III and IV only

C) II, III and IV only

D) II, III and IV only

D) II, III and IV only

E) l, II and IV only

E) l, II and IV only

#92. Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions

A) I only

A) I only

B) II only

B) II only

C) I and II only

C) I and II only

D) II and III only

D) II and III only

E) I,II and III

E) I,II and III

#93. A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

A) I, II and III

A) I, II and III

B) II and III only

B) II and III only

C) I and III only

C) I and III only

D) I and II only

D) I and II only

E) III only

E) III only

#94. Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

A) 1 : 4

A) 1 : 4

B) 2 : 1

B) 2 : 1

C) 2 : 3

C) 2 : 3

D) 2 : 5

D) 2 : 5

#95. I. A liquid boils when its saturated vapour pressure is equal to the external pressure II. Dissolved substances in pure water lead to increase in the boiling point. III. When the external pressure is increased, the boiling point increases. IV. Dissolved substances in pure water decrease the boiling point. Which combination of the above are peculiarities of the boiling point of a liquid?

A) I, II and III

A) I, II and III

B) I, II, III and IV

B) I, II, III and IV

C) I, II and IV

C) I, II and IV

D) II, III and IV

D) II, III and IV

Finish

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