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Physics 9th Class English Medium Unit 4 Online Test MCQs With Answers

Question # 1

If we increase the length of spanner the torque produced will be

Choose an answer

Increased

Decreased

Constant

Zero

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Question # 2

A body is said to be in __________ equilibrium if after a slight tilt return to its previous position:

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Stable

Unstable

Neutral

None

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Question # 3

If Fx and Fy are rectangular components of vector F, then its direction is determined by the relation

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θ = sin-1 Fv/Fx

θ = tan-1 Fx/Fy

θ = tan Fx/Fy

θ = tan Fy/Fx

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Question # 4

_____________ is related to earth attractive force.

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Centre of gravity

Acceleration

Velocity

Nil

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Question # 5

If there is no change in state of motion, then the body is said be i:

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Rest

Motion

Equilibrium

Rest & motion

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Question # 6

Sin 45^ois

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0.707

0.5

0.2

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Question # 7

Racing cars are made stable by :

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Increasing their speed

Decrease their mass

Lowering their center of gravity

Decreasing their width

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Question # 8

If the applied force is 'F' and its moment arm is 'r' then torque is defined as

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τ = rF

τ = r2F

τ = r + F

τ = 2rF

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Question # 9

A couple consists of which type of forces :

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Like parallel

Unlike parallel

Not parallel

Nil

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Question # 10

The single force that has the same effect as the combined effect of all the force to be added is called a

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Opposite force

Single force

Resultant force

Resultant vector

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Question # 11

PQ & RS are 2 parallel forces moving in same direction than they are called ............... forces.

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Like parallel

Unlike

Parallel

Nil

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Question # 12

The resultant vector of given vectors A and B is

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Question # 13

.............. is example of vector.

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Length

Force

Mass

Time

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