Question

MCQ with one or more correct answers.

1. Substance that flows is called [ ]

a) solid b) fluid c) water d) air

2. When a block of mass ‘m’ is moving up with an acceleration ‘a’. Then the buoyant force acting on

the block is [ ]

a) mf

(a – g) b)

mf

a g 

c) mf

(a + g) d) (mf

g) a

3. The upward force exerting by fluid on a body in that fluid is called [ ]

a) Normal force b) Pressure c) Weight d) Buyont force

4. If a body of mass ‘m’ is in a fluid. If the body suspends in the fluid, then [ ]

a) mg = B b) mg < B c) mg > B d) any of these

5. A cotton bundle and an iron piece of equal mass are weighed in air by a spring balance. The

reading of weight is more for [ ]

a) Iron b) Cotton

c) Both have same reading as they have same mass d) Can’t be compared

6. If weight of a body is greater than the buoyant force in a fluid, then [ ]

a) Body suspends in the fluid b) Body floats in the fluid

c) Body sinks in the fluid d) None of these

7. The physical quantity in fluids that is analogous to frictional force in case of solids is [ ]

a) Static friction b) Kinetic friction c) Rolling friction d) Viscous drag

8. The origin of all the forces except gravitational pull is [ ]

a) Friction b) Strong forces

c) Weak interaction d) Electromagnetic force

9. When a fluid element of mass m is moving down vertically with an acceleration ‘a’ then the

buoyant force act on it [ ]

a) B = m (a - g) b) B = m(a + g) c) B – mg d) B m a g    

10. When the speeds involed are small, the relation between visous drage and speed of the body is

a) Inversely proportional b) Directly proportional

c) Equal d) None of these​

Answer 1

Answer:

hope this  helps

Explanation:

1 fluid

2c

3 buoyant force

4 b

5c

6 c

7a

8b

9 c

10 a

Answer 2

Answer:

1. b)Fluid

2. c)mf

3. d)bouyant force

4. b) mg<b

5. c)both have same reading as they have same mass

6. c) body sinks in the fluid

7. a) static friction

8. b) strong forces

9. c)B-mg

10. a) inversely proportional.

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