1. When solid A of mass 2 g is immersed in a measuring cylinder filled with water, it displaces a volume of 4cm³. What is the density of the solid A?

A. 0.5 g cm-³ B. 2 g cm-³ C. 5 N cm-³ D. 20 N cm-³

2. A bottle full of water has a mass of 200g. When the same bottle is filled with liquid X, the mass becomes 180g. If the mass of the empty bottle is 100g, what is the density of liquid X? ( Take the density of water as 1.0g cm -³)

A. 0.2g cm-³ B. 0.8g cm-³ C. 0.9g cm-³ D. 1.2g cm-³

3. A wooden block of dimension 1 m X 1 m X 1 m has a mass of 800kg. A jar attached a steel plate of dimension 1 m X 1 m X 0.02 m to the block. Given that the steel plate has a mass of 140kg, what is the density of the combination?

A. 800kg m-³ B. 922kg m-³ C. 3900kg m-³ D. 7000kg m-³

4. A 100kg rock it being hung freely on the Moon. When an astronaut pushes the rock upwards, he will feel that

A. the rock us easier to be pushed than on Earth.

B. the rock is more difficult to be pushed as it is on Earth.

C. the rock requires as much effort to be pushed as on Earth.

D. the rock requires no effort to be pushed.

5. An astronaut in space wants to compare the mass of two balls. He holds the two balls in each of his hands and moves both hands up and down slightly for a few times. What is the reason for doing so?

A. He is trying to compare the inertia of two balls. The one with a higher mass tends to be more difficult to be moved and to be stopped.

B. He is trying to compare the weight of the two balls. The one with a higher mass tends to be easier to be moved and to be stopped.

C. He is trying to compare the weight of the two balls. The one with a higher weight tends to be more difficult to be moved and to be stopped.

D. He is trying to compare the weight of the two balls. The one with a higher weight tends to be easier to be moved and to be stopped.

6. Which if the following is true ( assuming the effect of air resistance is negligible) ?

A. The period of oscillation of a pendulum is longer on the Earth than on the Moon.

B. An object being thrown upwards on the Moon will reach the same height as when it is being thrown upwards in the Earth.

C. A ball thrown horizontally on the Moon will travel the same horizontal distance as when it is being thrown horizontally on the Earth.

D. A stone thrown upwards on the Moon will have the same maximum gravitational potential energy as when is it being thrown upwards on the Earth.

7. A rectangular metal block had a dimension of 5cm x 3 cm x 2cm. If the density of the metal is 8000 kgm³, find the mass of the block.

8. (a) A small container has a mass of 100g. When it is completely filled with water, it weighs 4N. If the density of water is 1000kgm³, find the capacity of the container. [The force of gravity acting on a mass of 1 kg is 10N.]

(b) The container is then emptied and completely filled with another liquid of density 850 kgm³. What is its weight now?

9. The weight of an insoluble object is 3.0N in air. It is placed into a measuring cylinder filled with some water. The amount of water displaced is 60 cm³. Determine the density of the object. [ The force of gravity acting on mass of 1kg is 10N ]

10. A piece of uniform copper wire 10m long had a mass of 0.35kg. If the density of copper is 8900 kgm³, determine the diameter of the wire.

11. Five coins have a mass of 50g each. When the coins were put into a measuring cylinder containing water, the level of the water rose from 24 cm³ to 48 cm³.

(a) Find the volume of one coin .
(b) Find the density of the coins.

12. If 100 cm³ of water is mixed with 300 cm³ of a liquid to form a mixture of density 850 kgm³. Find the density of the liquid , assuming that there is no contraction in volume .[Density of water = 1000 kgm³ ]