Q1. Universal law of gravitation does not explain
- Motion of the Moon around the Earth
- Motion of planets around the Sun
- Tides on the Earth due to the Moon
- Motion of electrons in an atom
- Q2. If relative density is 11.3 then the density of the substance in SI units will be
- 11.3 x 103 kg/m3
- 11.3 kg/m3
- 11.3 x 103 g/cm3
- 11.3 g/cm3
- Q3. A body experiences a upward force equal to twice the weight of liquid displaced by it.
- True
- False
- Q4. What will be the weight of a body on Moon if it weighs 48 N on the Earth?
- 48 N
- 8 N
- 9.8 N
- 98 N
- Q5. When an object is released freely from a certain height without applying any external force, then the object
- will move upwards with accelerated motion
- will move downwards with accelerated motion
- will move downwards with constant velocity
- will move upwards with a constant velocity
- Q6. A spring balance is used to _________ .
- measure weight only
- determine density
- determine mass as well as weight
- measure mass only
- Q7. A body just floating on a surface experiences zero buoyant force.
- True
- False
- Q8. The density of tap water is less than that of sea water. If an object is immersed completely in tap water and sea water one by one, then its loss in weight will be
- More in sea water
- Less in sea water
- Equal in two cases
- Zero in sea water but not so in tab water
- Q9. Which of following is not related to gravitational law?
- Motion of planets around the Earth
- Rainfall and Snowfall
- Occurrence of tides
- Thundering and lightning
- Q10. If we want to determine the volume of a solid by immersing it in water, the solid should be
- lighter than water
- heavier than water
- insoluble in water
- heavier than water and insoluble in it
- Q11. A piece of wood of R.D. 0.25 floats in a pail containing oil of R.D., of 0.81. The fraction of volume of the wood above the surface of the oil is :
- 0.31
- 0.69
- 0.21
- 0.79
- Q12. A rock is brought from the surface of the Moon to the Earth, then its weight will change but not mass.
- True
- False
- Q13. The magnitude of buoyant force depends on the density of liquid
- True
- False
- Q14. A student placed an iron cuboid of dimensions 4 cm × 6 cm × 10 cm on a tray filled with fine sand. He placed the cuboid in such a way that it was made to lie on the sand with its faces of dimension (a) 4 cm × 6 cm (b) 6 cm × 10 cm (c) 4 cm × 10 cm. If the density of iron is nearly 8 gcm-3 and g = 10 ms-2 than what will be the minimum and maximum pressure as calculated by the student?
- 16 Nm-2, 40 Nm-2
- 32 Nm-2, 80 Nm-2
- 640 Nm-2, 1600 Nm-2
- 3200 Nm-2, 8000 Nm-2
- Q15. What will be the thrust acting on the bottom surface of a tank having dimensions 4 m × 4 m × 4 m when fully filled with water of density 103 kg m-3?
- 6.27 × 105 N
- 6.27 × 104 N
- 62.7 × 105 N
- 6.27 × 106 Pa
- Q16. A man of mass 60 kg stands on a weighing machine of area 225 cm2. How much pressure will be exerted by him? (Take g = 10 m/s2)
- 26666.7 Pa
- 266.67 Pa
- 26.667 Pa
- 266666.7 Pa
- Q17. A piece of glass dropped in mercury will sink.
- True
- False
- Q18. If 'R' is the radius of the Earth, the height from the surface at which the weight of a body becomes one-fourth of its weight, on its surface is
- 2R
- R
- R/2
- R/4
- Q19. Pressure increases with increase in surface area and decreases with decrease in surface area.
- True
- False
- Q20. If a person can jump to a height of 9 m on the Moon, the height to which he can jump on the Earth with the same effort is
- 2.5 m
- 3.5 m
- 1.5 m
- 6 m
- Q21. A body weighs 48 N on the surface of the Earth, its weight at the centre of the Earth will be
- 24 N
- 48 N
- 96 N
- zero
- Q22. Which one of the following is a correct statement about the mass of a body?
- It remains constant at all places
- It changes from place to place
- It is more at the poles than at the equator
- It decreases as the body moves from Earth's surface to Moon's surface.
- Q22. Which one of the following is a correct statement about the mass of a body?
- It remains constant at all places
- It changes from place to place
- It is more at the poles than at the equator
- It decreases as the body moves from Earth's surface to Moon's surface.
- Q24. An object exerts a force F on a surface of surface area A. The pressure P acting on the surface is
- P = F/A
- P = A/F
- P = FA
- P = F/A2
- Q25. An object of larger size will sink more than an object of smaller size.
- True
- False
- Q26. When in equilibrium the buoyant force is balanced by the weight of an object or the gravitational force acting on it.
- True
- False
- Q27. What will be the volume of 90 gm copper if the density of copper is 9 g/cm3?
- 9 cm3
- 10 cm3
- 90 cm3
- 810 cm3
- Q28. What will be the magnitude of the gravitational force between the Earth and a body of 10 kg?
- 9.8 N
- 98 N
- 90 N
- 100 N
- Q29. What is the mass of a body whose weight is 59 N? Take g = 9.8 m/s2
- 50 kg
- 5 kg
- 6 kg
- 9 kg
- Q30. The relative density of a substance expresses the lightness of the substance in comparison to water.
- True
- False
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