PHYSICS PAST QUESTIONS AND ANSWERS
1. Which fundamental law of motion is called the law of inertia?
– A. Newton’s second law
– B. Newton’s third law
– C. Newton’s first law
– D. Law of Momentum
– Answer: C. Newton’s first law
2. Capillary action is due to the phenomenon of:
– A. Friction
– B. Surface tension
– C. Expansion
– D. Pressure
– Answer: B. Surface tension
3. Find the pressure due to the fluid at a depth of 0.76m in still water (ρw=1000kg/m3, g=9.8m/s2):
– A. 7.45kPa
– B. 7.45Pa
– C. 74.5kPa
– D. 745Pa
– Answer: A. 7.45kPa
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4. The property by which a body returns to its original size and shape when the forces that deformed it are removed is:
– A. Elasticity
– B. Capillarity
– C. Viscosity
– D. None of the above
– Answer: A. Elasticity
5. Which of the following is/are correct about the kinetic theory of matter?
– A. All the molecules of a particular element are identical
– B. The molecules make perfectly elastic collisions with one another
– C. The molecules are very small about 10^-10m in decimeter
– D. All of the above
– Answer: D. All of the above
6. Echo can be used to:
– A. Find the depth of the sea
– B. Explore gas and oil
– C. Measure the speed of sound in the air
– D. All of the above
– Answer: D. All of the above
7. The sound wave below the frequencies of audible sound is called:
– A. Audible sound
– B. Ultrasonic sound
– C. Infrasonic sound
– D. None of the above
– Answer: C. Infrasonic sound
8. Which of the following waves require a medium to travel?
– A. Light waves
– B. Sound waves
– C. Microwaves
– D. None of the above
– Answer: B. Sound waves
9. A body moves from rest with a constant acceleration of 5m/s². The distance covered in 5s is:
– A. 38m
– B. 62.5m
– C. 96m
– D. 124m
– Answer: B. 62.5m
10. Which of the following is the dimensional formula for Modulus of Elasticity?
– A. ML^-1 T^-1
– B. ML^-2 T^-2
– C. ML^-1 T^-3
– D. ML^-1 T^-2
– Answer: D. ML^-1 T^-2
11. Which of the following is not an example of simple harmonic motion?
– A. Oscillation of a mass attached to a string
– B. The oscillation of the strings of a musical instrument
– C. The oscillation of a loaded test tube floating in water
– D. All of the above
– Answer: C. The oscillation of a loaded test tube floating in water
12. A 10m wire is made to stretch to 11.6m by the application of a force. Calculate the tensile strain:
– A. 16.0
– B. 0.16
– C. 1.60
– D. 0.016
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– Answer: B. 0.16
13. Calculate the pressure due to water at a depth of 20m in water (Take the density of water = 1000kgm⁻³ and acceleration due to gravity = 9.8m/s²):
– A. 19600 Nm⁻²
– B. 196000 Nm⁻²
– C. 1960 Nm⁻²
– D. 196 Nm⁻²
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– Answer: B. 196000 Nm⁻²
14. The upthrust of an object immersed in a liquid is equivalent to:
– A. Density x volume x acceleration
– B. Weight of the object + immersed liquid
– C. Weight of the fluid displaced
– D. Volume of the fluid displaced
– Answer: C. Weight of the fluid displaced
15. Convert 98.6°F to °C:
– A. 130.6°C
– B. 66.6°C
– C. 39°C
– D. 37°C
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– Answer: D. 37°C
16. If the period of a wave is 4 sec, what is the frequency of the wave?
– A. 4Hz
– B. 25Hz
– C. 0.25Hz
– D. 40Hz
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– Answer: C. 0.25Hz
17. The internationally accepted systems of units for physical measurement are:
– A. kg, cm, sec
– B. g, m, sec
– C. g, cm, sec
– D. kg, m sec.
– Answer: D. kg, m sec.
18. The following are vector quantities except:
– A. temperature
– B. electric field strength
– C. weight
– D. force.
– Answer: A. temperature
19. A force of 10 N acts on a body for 20 seconds. Calculate the impulse of the body?
– A. 200 Ns
– B. 100 Ns
– C. 30 Ns
– D. 2 Ns.
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– Answer: A. 200 Ns
20. Which of the following moduli is associated with liquids and gases?
– A. Young
– B. Stress
– C. Bulk
– D. Shear
– Answer: C. Bulk
21. Calculate the pressure due to water at a depth of 15 m if the density of water is 1000 kg/m³:
– A. 147 kPa
– B. 150 kPa
– C. 280 kPa
– D. 900 kPa.
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– Answer: A. 147 kPa
22. A radio station sends out a broadcast on a frequency of 800 KHz through radio waves of velocity 3×10⁸m/s. Find the wavelength of the broadcast:
– A. 375m
– B. 267m
– C. 240m
– D. 187m
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– Answer: A. 375m
23. Shadows and eclipses result from the:
– A. refraction of light
– B. reflection of light
– C. rectilinear propagation of light
– D. diffraction of light.
– Answer: C. rectilinear propagation of light
24. Which of the following is the dimensional formula for Modulus of Elasticity?
– A. ML^-1 T^-1
– B. ML^-2 T^-2
– C. ML^-1 T^-3
– D. ML^-1 T^-2
– Answer: D. ML^-1 T^-2
25. In elastic collisions:
– A. Only the total momentum of the colliding objects is conserved.
– B. Only the total kinetic energy is conserved.
– C. Both of the momentum and total kinetic energy are conserved.
– D. Neither the momentum of the colliding bodies nor the total kinetic energy are recoverable.
– Answer: C. Both of the momentum and total kinetic energy are conserved
26. If extension in spring is proportional to the load applied, then the material obeys :
– A. Newton’s law
– B. gravitational law
– C. Charles’s law
– D. Hooke’s law
– Answer: D. Hooke’s law
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27. Specific weight of sea water is more than that of pure water because it contains ________:
– A. Dissolved air
– B. Dissolved salt
– C. Suspended matter
– D. All of the above
– Answer: B. Dissolved salt
28. If the surface of the liquid is convex, the:
– A. Cohesion pressure is negligible
– B. Cohesion pressure is decreased
– C. Cohesion pressure is increased
– D. None of the above
– Answer: C. Cohesion pressure is increased
29. When there are no external forces, the shape of a liquid drop is determined by:
– A. Surface Tension of the liquid
– B. The density of the liquid
– C. The viscosity of the liquid
– D. The temperature of air only
– Answer: A. Surface Tension of the liquid
30. A drop of oil is placed on the surface of the water. Which of the following statements is correct?
– A. It will remain on it as a sphere
– B. It will spread as a thin layer
– C. It will partly be as spherical droplets and partly as thin films
– D. It will float at the distorted drop on the water surface.
– Answer: C. It will partly be as spherical droplets and partly as thin films
