NEET Physics: Questions 197 - 200 of 2098

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Question number: 197

» Laws of Motion » Centripetal Force

MCQ▾

Question

Choose the correct statements

(1) Centripetal force is not a real force. It is only the requirement for circular motion.

(2) Work done by centripetal force may or may not be zero.

(3) Work done by centripetal force is always zero.

(4) Centripetal force is a fundamental force.

Choices

Choice (4) Response

a.

1, 2 and 3

b.

1 and 3

c.

2 and 4

d.

1 and 2

Question number: 198

» Kinematics » Motion in a Straight Line

Assertion-Reason▾

Assertion (Ꭺ)

A cyclist is cycling on rough horizontal circular track with increasing speed. Then the frictional force on cycle is always directed towards center of the circular track.

Reason (Ꭱ)

For a particle moving in a circle, radial component of net force should be directed towards center. You have to select the correct choice.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 199

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The angular speed with which the earth would have to rotate on its axis so that a person on the equator would weigh (3/5) th as much as present, will be: (Take the equatorial radius as 6400 km)

Choices

Choice (4) Response

a.

7.8 x 10 3 rad/sec

b.

7.8 x 10 4 rad/sec

c.

8.7 x 10 3 rad/sec

d.

8.7 x 10 4 rad/sec

Passage

Velocity at a general point P (x, y) for a horizontal projectile motion is given by

V = VX2+VY2 tanα = VYVX

The image is velocity graph.

The Image Is Velocity Graph.

here in following fig we shows that the projectile motion of particle at some point to another point.

α is angle made by v with horizontal in clockwise direction Trajectory equation for a horizontal projectile motion is given by x = v x t = ut

y =- ( 12 ) gt 2

Picture display is velocity graph.

Picture Display Is Velocity Graph.

here in fig we shows that angle α made by v with horizontal in clockwise direction

Eliminating t, We get y =- 12 gx2u2

Question number: 200 (1 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

An aeroplane is flying horizontally with a velocity of 720 km/h at an altitude of 490 m. When it is just vertically above the target a bomb is dropped from it. How far horizontally it missed the target?

Choices

Choice (4) Response

a.

2000 m

b.

200 m

c.

1000 m

d.

100 m

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