EWT | Academic Question

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Question (1)
QN0035032

What are the effects if force is acting on a moving body in a direction perpendicular to the direction of motion?

  • (A)

    The speed changes uniformly 

  • (B)

    The acceleration changes uniformly

  • (C)

    The direction of motion changes

  • (D)

    All of these

Correct Answer: C
Explanation:

When force is applied on a moving body in a direction perpendicular to the direction of motion, then it takes a circular path. Thus the direction of motion changes without changes in the speed.

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Question (2)
QN0035033

On a banked road, which force is essential to provide the necessary centripetal force to a car to take a turn while driving at the optimum speed?

  • (A)

    Component of normal reaction

  • (B)

    Component of frictional force

  • (C)

    Both (a) & (b)

  • (D)

    None of these

Correct Answer: A
Explanation:

Optimum speed is given by  on a banked road, the normal reaction's component is enough to provide the necessary centripetal force to a car driven at optimum speed.

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Question (3)
QN0035034

A cyclist taking turn bends inwards while a car passenger taking the same turn is thrown outwards. The reason is.         

  • (A)

    car is heavier than cycle 

  • (B)

    car has four wheels while cycle has only two

  • (C)

    difference in the speed of the two

  • (D)

    cyclist must counteract the centrifugal force while in case of car only the passenger is thrown by this force

Correct Answer: D
Explanation:

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Question (4)
QN0035035

A car takes a circular turn with a uniform speed . If the reaction at inner and outer wheels be denoted by  and , then

  • (A)

  • (B)

     

  • (C)

  • (D)

    None of these

Correct Answer: B
Explanation:

Due to centrifugal force, the inner wheel will be left up when car is taking a circular turn. Due to this, the reaction on outer wheel is more than that on inner wheel.

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Question (5)
QN0035036

A cyclist bends while taking turn in order to 

  • (A)

    reduce friction 

  • (B)

    provide required centripetal force

  • (C)

    reduce apparent weight

  • (D)

    reduce speed

Correct Answer: B
Explanation:

The cyclist bends while taking turn in order to provide necessary centripetal force.

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Question (6)
QN0035037
  1. The motion of a car on a banked road is shown in the figure. The centripetal force equation will be given by

  • (A)

  • (B)

              

  • (C)

  • (D)

Correct Answer: A
Explanation:

Clearly form the figure,  and  contribute to the centripetal force.

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Question (7)
QN0035038

A car moves at a speed of  on a banked track and describes an arc of a circle of radius . The angle of banking is 

  • (A)

  • (B)

         

  • (C)

         

  • (D)

Correct Answer: D
Explanation:

Angle of banking is 

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Question (8)
QN0035039

Maximum speed of car for safe turning on horizontal road is

  • (A)

     

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

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Question (9)
QN0035040

The minimum velocity (in  ) with which a car driver must traverse a flat curve of radius  and coefficient of friction 0.6 to avoid skidding is

  • (A)

    60

  • (B)

    30

  • (C)

    15        

  • (D)

    25

Correct Answer: B
Explanation:

For negotiating a circular curve on a levelled road, the maximum velocity of the car is

Here

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Question (10)
QN0035041

The coefficient of friction between the rubber tyres and the road way is 0.25 . The maximum speed with which a car can be driven round a curve of radius  without skidding is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: B
Explanation:

or

or

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