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Shilpa

HomeAuthor: ShilpaPage 8

6. A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is

(a)  (rω)/(2g)                        (b)  (r2 ω2 )/(2g) (c)  √2grω   ...

5. A body floats in a liquid contained in a beaker. The whole system as shown falls freely under gravity. The upthrust on the body due to the liquid is

(a)  Zero (b)  Equal to the weight of the liquid displaced (c)   Equal to the weight of the body in...

18. Assertion : Machine parts are jammed in winter. Reason : The viscosity of lubricant used in machine parts increase at low temperature.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

13. Assertion : For a floating body to be in stable equilibrium, its centre of buoyancy must be located above the centre of gravity. Reason : The torque produced by the weight of the body and the upthrust will restore body back to its normal position, after the body is disturbed.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

11. Assertion : The size of the needle of a syninge controls flow rate better than the thumb pressure exerted by a doctor while administering an injection. Reason : Flow rate is independent of pressure exerted by the thumb of the doctor.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

9. Assertion : The velocity of flow of a liquid is smaller when pressure is larger and viceversa. Reason : According to Bernoulli’s theorem, for the stream line flow of an ideal liquid, the total energy per unit mass remains constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

4. A vessel contains oil

(density = 0.8 gm/cm3) over mercury (density = 13.6 gm/cm3). A homogeneous sphere floats with half of its volume immersed...

3. A wooden block, with a coin placed on its top, floats in water as shown in fig. the distance l and h are shown there. After some time the coin falls into the water. Then

(a) l decreases and h increases (b)  l increases and h decreases (c)   Both l and h increase (d)  Both...

2. A homogeneous solid cylinder of length L (L<H/2). Cross-sectional area A/5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L/4 in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure

P0 . Then density D of solid is given by (a)  5d/4 (b) 4d/5 (c)   d (d)   d/5 Answer-a (7)

1. A U-tube in which the cross-sectional area of the limb on the left is one quarter, the limb on the right contains mercury

(density 13.6 g/cm3). The level of mercury in the narrow limb is at a distance of 36 cm from the...

28. Assertion :   Bernoulli’s theorem holds for incompressible, non-viscous fluids.

Reason        :   The factor v2/2g is called velocity head. (a)       If both assertion and reason are true and the...

27. Assertion : Cars and aeroplanes are streamlined. Reason : This is done to reduce the backward drag due to atmosphere.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

26. Assertion : When two boats sails parallel in the same direction and close to each other, they are pulled towards each other. Reason : The viscous drag on a spherical body moving with speed v is proportional to v.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

20. Assertion : A rain drop after falling through some height attains a constant velocity. Reason : At constant velocity, the viscous drag is just equal to its weight.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

17. Assertion : Sudden fall of pressure at a place indicates strom. Reason : Air flows from higher pressure to lower pressure.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

16. Assertion : Aeroplanes are made to run on the runway before take off, so that they acquire the necessary lift. Reason : According to Bernoulli’s theorem, as velocity increases pressure decreases and viceversa.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

14. Assertion : Water flows faster than honey. Reason : The coefficient of viscosity of water is less than honey.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

12. Assertion : A fluid flowing out of a small hole in a vessel apply a backward thrust on the vessel. Reason : According to equation of continuity, the product of area and velocity remain constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

10. Assertion : The shape of an automobile is so designed that its front resembles the stream line pattern of the fluid through which it moves. Reason : The resistance offered by the fluid is maximum.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

8. Assertion : The velocity of fall of a man jumping with a parachute first increases and then becomes constant. Reason : The constant velocity of fall of man is called terminal velocity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

6. Assertion : A piece of ice floats in water, the level of water remains unchanged when the ice melts completely. Reason : According to Archimede’s principle, the loss in weight of the body in the liquid is equal to the weight of the liquid displaced by the immersed part of the body.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

5. Assertion : A man sitting in a boat which is floating on a pond. If the man drinks some water from the pond, the level of the water in the pond decreases. Reason : According to Archimede’s principle the weight displaced by body is equal to the weight of the body.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

4. Assertion : To float, a body must displace liquid whose weight is greater than the actual weight of the body. Reason : The body will experiences no net downward force, in the case of floating.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

3. Assertion : Hydrostatic pressure is a vector quantity. Reason : Pressure is force divided by area, and force is a vector quantity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

2. Assertion : The blood pressure in humans is greater at the feet than at the brain. Reason : Pressure of liquid at any point is proportional to height, density of liquid and acceleration due to gravity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

1. Assertion : Pascal law is the working principle of a hydraulic lift. Reason : Pressure is equal to thrust per area.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

5. From amongst the following curves, which one shows the variation of the velocity v with time t for a small sized spherical body falling vertically in a long column of a viscous liquid

Answer-d (142)

66. An incompressible fluid flows steadily through a cylindrical pipe which has radius 2r at point A and radius r at B further along the flow direction. If the velocity at point A is v, its velocity at point B is

(a)  2v                                       (b)  v (c)   v/2                                     (d)  4v Answer-d (6)

25. Assertion : Terminal velocity is same as the critical velocity. Reason : The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

24. Assertion : To empty an oil tank, two holes are made. Reason : Oil will come out two holes so it will emptied faster.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

23. Assertion : It is difficult to stop bleeding from a cut in the body at high altitudes. Reason : The atmospheric pressure at high altitude is lesser than the blood pressure.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

22. Assertion : Railways tracks are laid on small sized wooden sleepers. Reason : Small sized wooden sleepers are used so that rails exert more pressure on the railway track. Due to which rail does not leave the track

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

21. Assertion : paper pins are made to have pointed end. Reason : Because pointed pins have very smalll area due to which even for small applied force it exert large pressure on the surface.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

19. Assertion : A block of wood is floating in a tank containing water. The apparent weight of the floating block is equal to zero. Reason : Because the entire weight of the block is supported by the buoyant force (the upward thrust) due to water.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

15. Assertion : The viscosity of liquid increases rapidly with rise of temperature. Reason : Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

7. Assertion : The velocity increases, when water flowing in broader pipe enter a narrow pipe. Reason : According to equation of continuity, product of area and velocity is constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

4. Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure p at points along the axis is represented by

Explanation-(a) When cross-section of duct is decreased, the velocity of water increased and in accordance with Bernoulli’s theorem, the pressure...

2. A small spherical solid ball is dropped from a great height in a viscous liquid. Its journey in the liquid is best described in the diagram given below by the

(a)   Curve A (b)  Curve B (c)   Curve C (d)  Curve D Answer-b (49)

1. A lead shot of 1mm diameter falls through a long column of glycerine. The variation of its velocity v. with distance covered is represented by

Answer-a (117)

65. Consider the following equation of Bernouilli’s theorem.

  P + (1/2)ρV2 + ρgh =K(constant) The dimensions of K/P are same as that of which of the following...

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