NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 895 - 900 of 2320

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Question number: 895

» Work, Energy and Power » Potential Energy

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MCQ▾

Question

A particle of mass 4 m which is at rest explodes into three fragments two of the fragments each of mass m are found to move each with a speed v making an angle 90° with each other. The total energy released in this explosion is –

Choices

Choice (4)Response

a.

b.

c.

d.

Passage

Read the passage given below and answer the questions that follows:

Finding elongation of the spring

Finding Elongation of the Spring

A bead of mass m is attached to one end of a spring of natural length R and spring constant The other end of the spring is fixed at point A on a smooth ring of radius R as shown in figure. When bead is released to move then

Question number: 896 (1 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

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Tangential acceleration of bead just after it is released.

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 897 (2 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

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Question

Initial elongation in the spring is -

Choices

Choice (4)Response

a.

b.

R

c.

2R

d.

Question number: 898 (3 of 3 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

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The normal reaction force at B is -

Choices

Choice (4)Response

a.

3 mg

b.

mg/2

c.

3 mg/2

d.

mg

Question number: 899

» Laws of Motion » Force and Inertia

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Question

A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration ‘a’ directed horizontally as shown in figure. Other end of the string is pulled with constant acceleration ‘a’ vertically. The tension in the string is –

A bob is hanging over a pulley inside a car through a string

A Bob is Hanging over a Pulley Inside a Car through a String

Choices

Choice (4)Response

a.

m (g - a)

b.

c.

d.

Question number: 900

» Kinematics » Average Speed and Instantaneous Velocity

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Question

The mass of a rocket is 500 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4)Response

a.

10 kg/s

b.

30 kg/s

c.

60 kg/s

d.

45 kg/s

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