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Question (31)

QN006442

Which simple machine is present in a door knob?

(A) Pulley
(B) Lever
(C) Wheel and axle
(D) Inclined plane

Correct Answer: C

Explanation:

Door knobs use wheel and axle arrangement.

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Question (32)

QN006443

A spanner is mainly an example of:

(A) Lever
(B) Pulley
(C) Screw
(D) Wedge

Correct Answer: A

Explanation:

Spanner acts as a lever.

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Question (33)

QN006444

Which simple machine is used in ramps?

(A) Inclined plane
(B) Pulley
(C) Screw
(D) Lever

Correct Answer: A

Explanation:

Ramp is an inclined plane.

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Question (34)

QN006445

The efficiency of a machine is always:

(A) Greater than 100%
(B) Equal to 100%
(C) Less than or equal to 100%
(D) Infinite

Correct Answer: C

Explanation:

Efficiency can never exceed 100%.

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Question (35)

QN006446

Which machine converts rotational motion into linear motion?

(A) Screw
(B) Lever
(C) Wedge
(D) Pulley

Correct Answer: A

Explanation:

Screw converts rotational motion into linear motion.

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Question (36)

QN006447

A machine has mechanical advantage 5. If effort is 80 N, load lifted is:

(A) 16 N
(B) 85 N
(C) 400 N
(D) 800 N

Correct Answer: C

Explanation:

Load = MA × Effort = 5 × 80 = 400 N

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Question (37)

QN006448

The sharp edge of an axe works as a:

(A) Lever
(B) Screw
(C) Wedge
(D) Pulley

Correct Answer: C

Explanation:

Axe edge acts as a wedge.

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Question (38)

QN006449

Which simple machine is used in a screwdriver?

(A) Pulley
(B) Wheel and axle
(C) Lever
(D) Inclined plane

Correct Answer: B

Explanation:

Screwdriver works as wheel and axle.

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Question (39)

QN006450

Mechanical advantage greater than 1 means:

(A) Effort is greater than load
(B) Machine increases force
(C) No work is done
(D) Efficiency is zero

Correct Answer: B

Explanation:

MA greater than 1 means force multiplication.

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Question (40)

QN006451

A pair of tongs is an example of:

(A) First class lever
(B) Second class lever
(C) Third class lever
(D) Pulley

Correct Answer: C

Explanation:

Tongs are third class levers.

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Question (31)

Which simple machine is present in a door knob?

Explanation:

Link:

Question (32)

A spanner is mainly an example of:

Explanation:

Link:

Question (33)

Which simple machine is used in ramps?

Explanation:

Link:

Question (34)

The efficiency of a machine is always:

Explanation:

Link:

Question (35)

Which machine converts rotational motion into linear motion?

Explanation:

Link:

Question (36)

A machine has mechanical advantage 5. If effort is 80 N, load lifted is:

Explanation:

Link:

Question (37)

The sharp edge of an axe works as a:

Explanation:

Link:

Question (38)

Which simple machine is used in a screwdriver?

Explanation:

Link:

Question (39)

Mechanical advantage greater than 1 means:

Explanation:

Link:

Question (40)

A pair of tongs is an example of:

Explanation:

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