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Question (11)

QN0035054

A person of mass is inside a lift of mass and presses the button on control panel. The lift starts moving upwards with an acceleration . If , the tension in the supporting cable is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Total mass

Let be the tension in the supporting cable, then

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Question (12)

QN0035055

If two masses ( ) are connected on a horizontal plane and a force is applied on the combination, then the tension depends on

(A)
the force applied on the system
(B)
whether force is applied on or
(C)
both (a) and (b)
(D)
Can't be predicted.

Correct Answer: B

Explanation:

When force is applied on

then and when force is applied on , then . Thus value of is different for each case. And it depends on whether the force is applied on , or .

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Question (13)

QN0035056

For the system shown in figure, the correct expression is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Common acceleration of system is

Force on is

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Question (14)

QN0035057

Which of the following is true about acceleration, a for the system?

(A)
Acceleration is more in A, when force is applied on A.
(B)
Acceleration is more in B, when force is applied on B.
(C)
Acceleration is same and does not depend on whether the force is applied on or
(D)
Acceleration depends on the tension in the string.

Correct Answer: C

Explanation:

So the acceleration is same whether the force is applied on or .

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Question (15)

QN0035058

Two blocks of masses and are attached by an inextensible light string as shown in the figure. If a force of 120 pulls the blocks vertically upward, the tension in the string is
(take )

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Acceleration of the system

From figure

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Question (16)

QN0035059

Three identical blocks of masses are drawn by a force with an acceleration of on a frictionless surface, then what is the tension (in ) in the string between the blocks and ?

(A)
9.2
(B)
3.4
(C)
4
(D)
9.8

Correct Answer: B

Explanation:

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Question (17)

QN0035060

A block and a block move together on a horizontal frictionless surface. Each block exerts a force of on the other. The block move with a uniform acceleration of

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

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Question (18)

QN0035061

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads , when the lift is stationary. If the lift moves downward with an acceleration of , the reading of the spring balance will be

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

For the bag accelerating down

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Question (19)

QN0035062

The elevator shown in fig. is descending with an acceleration of . The mass of the block . The force exerted by the block on block is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (20)

QN0035063

A block A of mass is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass at the other end. The acceleration of the system is (given )

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (11)

A person of mass is inside a lift of mass and presses the button on control panel. The lift starts moving upwards with an acceleration . If , the tension in the supporting cable is

Explanation:

Link:

Question (12)

If two masses ( ) are connected on a horizontal plane and a force is applied on the combination, then the tension depends on

Explanation:

Link:

Question (13)

For the system shown in figure, the correct expression is

Explanation:

Link:

Question (14)

Which of the following is true about acceleration, a for the system?

Explanation:

Link:

Question (15)

Two blocks of masses and are attached by an inextensible light string as shown in the figure. If a force of 120 pulls the blocks vertically upward, the tension in the string is(take )

Explanation:

Link:

Question (16)

Three identical blocks of masses are drawn by a force with an acceleration of on a frictionless surface, then what is the tension (in ) in the string between the blocks and ?

Explanation:

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Question (17)

A block and a block move together on a horizontal frictionless surface. Each block exerts a force of on the other. The block move with a uniform acceleration of

Explanation:

Link:

Question (18)

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads , when the lift is stationary. If the lift moves downward with an acceleration of , the reading of the spring balance will be

Explanation:

Link:

Question (19)

The elevator shown in fig. is descending with an acceleration of . The mass of the block . The force exerted by the block on block is

Explanation:

Link:

Question (20)

A block A of mass is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass at the other end. The acceleration of the system is (given )

Explanation:

Link:

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Two blocks of masses and are attached by an inextensible light string as shown in the figure. If a force of 120 pulls the blocks vertically upward, the tension in the string is
(take )