Test Series-13

## Instructions

• Your test contains 15 multiple choice questions with only one answer
• This is 30 min test.Please make sure you complete it in stipulated time
• You can Finish this test any time using 'Submit' button.
• Once finished you get a chance to review all question with correct answers and their solutions.

1.The dimensions of viscosity in terms of M,L,T is ?
• ML1T-1
• M-1LT-1
• ML-1T-2
• ML-1T-1

2. A man is sitting in a boat which is floating on a pond. The man drinks some water from pond. What happens to the water level in the pond? The water level will
• Rises
• falls
• remains unchanging
• Not enough information

3. A body floats in water with 40% of its volume outside water.When the same body floats in some liquid,60% of its volume remains outside the liquid. The relative density of the liquid is
• 1.5
• 1.2
• .6
• None of these

4..A closed compartment containing gas is moving with some acceleration in horizontal direction. Then the pressure in the compartment is? Neglect the effect of gravity
• lower in the front side
• same everywhere
• lower in the rear side
• Not enough information

5.A object of relative density 10 is released from rest on the surface of a lake.if the viscous effect are ignored ,the object sinks in the water with an acceleration ?
• 10g
• 9g/10
• 11g/10
• None of these

6. Machine parts are jammed in winter due to
• Increase in surface tension of lubricant
• Decrease in viscosity of lubricant
• Decrease in surface tension of lubricant
• increase in viscosity of lubricant

7. A horizontal pipeline carries water in a stream line flow? At point A along the pipe,the cross-sectional ared is 10cm2,the water velocity is 1m/s amd pressure is 2000Pa.What is the pressure at point B where cross-sectional area is 5.0 cm2
• 500 Pa
• 400 Pa
• 300Pa
• None of the above

8. A big drop of water is broken into large number of small drops? The surface energy would
• Remains unchanged
• will increase
• will decrease
• Not enough information

9.A U tude containing a liquid is acclerated horizontally with constant acceleration a .The separation between the limb's is L. The Difference in the height of the liquid in the two arms would be
• L(a/g)1/2
• aL/gL
• L/2
• a2L/g2L

10.A block of wood has a mass 25 g. When a 5g metal piece with a volume 2cm3 is attached to the bottom of the block,the wood barely floats in water what is the volume of the V of the wood
• 20cm3
• 38cm3
• 28cm3
• None of these

11. A solid sphere of radius R,made up of a material of bulk modulus K is surrounded by a liquid in a cylinderical container. A massless piston of area A floats on the surface of the liquid.When a mass M is placed on the piston to compress the liquid,the fractional change in the radius of the sphere is
• Mg/2AK
• 3Mg/AK
• Mg/3AK
• Mg/AK

12. A small hole is there near the bottom of the water filled container. The speed of the water ejected depends on
• Density of the liquid
• acceleration due to gravity
• height of the liquid above the hole
• All of the above
13. if the hollow bob of a simple pendulum be filled with mercury that drains out slowly,its time period
• increases continously
• decreases continously
• remains same
• first increases and then decreases
14. Water leaves a faucet with a downward velocity of 3 m/s. As the water falls below the faucet,it accelerates with acceleration g. The cross-section area of the water stream leaving the faucet is 1.0 cm2. What is the cross-sectional area of the stream .5m below the faucet?
• .50 cm2
• .9 cm2
• .1 cm2
• .69 cm2
15. Water rises to a height of 13.6 cm in a capillary tube dipped in water.When the same tube is dipped in mercury ,it is depressed by 3(2)1/2. The angle of contact in water =0 The angle of contact in mercury =1350 Given : Relative density of mercury =13.6 Find out the ratio of the surface tensions of mercury and water
• 6
• 5
• 11
• None of these