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Gravitation Worksheet-6

Gravitation Worksheet-6

 

  1. An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be :

A. 2 N                 B. 8 N                 C. 10 N               D. 12 N

 

  1. A rectangular wooden block has length, breadth and height of 50 cm, 25 cm and 10 cm, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?

A. The maximum pressure is exerted when the length and breadth form the base

B. The maximum pressure is exerted when length and height form the base

C. The maximum pressure is exerted when breadth and height form the base

D. The minimum pressure is exerted when length and height form the base

 

  1. An object is put in three liquids having different densities, one by one. The object floats with (1/9), (2/11) and (3/7) parts of its volume outside the surface of liquids of densities d1, d2 and d3 respectively. Which of the following is the correct order of the densities of the three liquids?

A. d1 > d2 > d3                               B. d2 > d3 > d1

C. d1 < d2 < d3                               D. d3 > d2 > d1

 

  1. A metal in which even iron can float is :

A. Sodium                                      B. Magnesium

C. Mercury                                     D. Manganese

 

  1. Four balls, A, B, C and D displace 10 ml, 24 ml, 15 ml and 12 ml of a liquid respectively, when immersed completely. The ball which will undergo the maximum apparent loss in weight will be:

A. A                     B. B                     C. C                     D. D

 

  1. The relative densities of four liquids P, Q, R and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is floated in all these liquids, one by one. In which liquid the object will float with its maximum volume submerged under the liquid?

A. P                     B. Q                     C. R                     D. S

 

  1. A solid of density 900 kg/m3 floats in oil as shown in the given diagram. The oil floats on water of density 1000 kg/m3 as shown. The density of oil in kg/m3 could be :

A. 850                B. 900                C. 950                 D. 1050

 

  1. The density of water is 1000 kg/m3 and the density of copper is 8900 kg/m3. Which of the following statements is incorrect?

A.

B.

C.

D.

 

  1. The diagrams represent four measuring cylinders containing liquids. The mass and volume of the liquid in each cylinder are stated. Which two measuring cylinders could contain an identical liquid?

A. W and X        B. W and Y        C. X and Y         D. X and Z

 

  1. Consider the following information in respect of four objects A, B, C and D :

Which object would float on water?

A. A                     B. B                     C. C                     D. D

 

Answer Key:

  1. A

 

  1. C

Explanation: Pressure = force/area so if area is less pressure will increase.

 

  1. C

 

  1. C

 

  1. B

 

  1. C

 

  1. C

Explanation: The density of oil must be greater than solid but less than water than only the solid will float on oil and oil will float on water.

 

  1. B

 

  1. D

Explanation: In X and Z densities of the liquid are same hence they will be same.

 

  1. D

Explanation: Using relation density = mass/volume complete the table.  Density of water is 1000 kg/m3  so the object having density less than water will float on water. So object D is the correct answer.