NEET Physics Circular Motion and Banking of Road MCQs Set 01

a) The direction of motion changes

b) All of these

c) The acceleration changes uniformly

d) The speed changes uniformly

Answer: The direction of motion changes

Question: 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

d) None of these

Answer: Component of normal reaction

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

a) cyclist has to counteract the centrifugal force while in the case of car only the passenger is thrown by this force

b) difference in the speed of the two

c) car has four wheels while cycle has only two

d) car is heavier than cycle

Answer: cyclist has to counteract the centrifugal force while in the case of car only the passenger is thrown by this force

Question:  A car takes a circular turn with a uniform speed u. If the reaction at inner and outer wheels be denoted by R₁ and R₂, then

a) R₁ < R₂

b) R₁ = R₂

c) R₁ > R₂

d) None of these

Answer: R₁ < R₂

Question: A cyclist bends while taking turn in order to

a) provide required centripetal force

b) reduce friction

c) reduce apparent weight

d) reduce speed

Answer: provide required centripetal force

Question: A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

a) its speed is constant

b) it moves in a straight line

c) its acceleration is constant

d) its velocity is constant

Answer:  its speed is constant

Question: A train is moving with a speed of 36 km/hour on a curvedpath of radius 200 m. If the distance between the rails is 1.5 m, the height of the outer rail over the inner rail is

a) 0.075 m

b) 0.75 m

c) 0.5 m

d) 1 m

Answer: 0.075 m

Question: A car moving on a horizontal road may be thrown out of the road in taking a turn

a) due to the lack of proper centripetal force

b) due to the rolling frictional force between the tyre and road

c) due to the reaction of the ground

d) by the gravitational force

Answer: due to the lack of proper centripetal force

Question: A car sometimes overturns while taking a turn. When it overturns, it is

a) the inner wheel which leaves the ground first

b) the outer wheel which leaves the ground first

c) both the wheel leave the ground simultaneously

d) either wheel will leave the ground first

Answer: the inner wheel which leaves the ground first

More Questions.........................................

Question:  On a railway curve the outside rail is laid higher than the inside one so that resultant force exerted on the wheels of the rail car by the tops of the rails will

a) have a horizontal inward component

b) be vertical

c) equilibriate the centripetal force

d) be decreased

Answer: have a horizontal inward component

Question: Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle.
Reason : In uniform circular motion, velocity remains constant.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question: The minimum velocity (in ms^-1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is

a) 30

b) 15

c) 25

d) 60

Answer:  30

Question: A mass m is revolving in a vertical circle at the end of a string of length 20 cm. By how much does the tension of the string at the lowest point exceed the tension at the topmost point?

a) 6 m g

b) 8 m g

c) 4 m g

d) 2 m g

Answer: 6 m g

Question:  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 20 m without skidding is (g = 9.8 m/s²)

a) 7 m/s

b) 10 m/s

c) 14 m/s

d) 5 m/s

Answer: 7 m/s

Question:  What will be the maximum speed of a car on a road turn of radius 30 m if the coefficient of friction between the tyres and the road is 0.4 (Take g = 9.8 m/s²)

a) 10.84 m/s

b) 8.84 m/s

c) 9.84 m/s

d) 6.84 m/s

Answer: 10.84 m/s

Question:  A bridge is in the from of a semi-circle of radius 40m. The greatest speed with which a motor cycle can cross the bridge without leaving the ground at the highest point is (g = 10 m s^–2) (frictional force is negligibly small)

a) 20 m s^–1

b) 30 m s^–1

c) 15 m s^–1

d) 40 m s^–1

Answer:  20 m s^–1

Question: Keeping the banking angle same, to increase the maximum speed with which a vehicle can travel on the curved road by 10%, the radius of curvature of the road has to be changed from 20 m to :

a) 24.2 m

b) 30.5 m

c) 18 m

d) 16 m

Answer: 24.2 m

Question: A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of the circle is 1.2 m, then tension in the string when the body is at the top of the circle, is

a) 41.56 N

b) 89.86 N

c) 109.86 N

d) 115.86 N

Answer:  41.56 N

Question: A bucket tied at the end of a 1.6 m long string is whirled in a vertical circle with constant speed. What should be the minimum speed so that the water from the bucket does not spill when the bucket is at the highest position?

a) 4 m/sec

b) 16 m/sec

c) 6.25 m/sec

d) None of these

Answer: 4 m/sec

Question:  A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of 0.5 m/s. What is the height of the plane of circle from vertex of the funnel?

a) 2.5 cm

b) 4 cm

c) 2 cm

d) 0.25 cm

Answer: 2.5 cm

Question: An aircraft executes a horizontal loop with a speed of 150 m/s with its wings banked at an angle of 12°. The radius of the loop is : (g = 10 m/s²)

a) 10.6 km

b) 9.6 km

c) 7.4 km

d) 5.8 km

Answer: 10.6 km