NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 939 - 942 of 2142

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

Question number: 939

» Work, Energy and Power » Work Done

MCQ▾

Question

A chain of linear density 5 kg/m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

Choices

Choice (4) Response

a.

98 J

b.

196 J

c.

392 J

d.

235.2 J

Question number: 940

» Work, Energy and Power » Work Done

Assertion-Reason▾

Assertion (Ꭺ)

Sum of work done by the Newton’s 3 rd law pair internal forces, acting between two panicles may be zero.

Reason (Ꭱ)

If two particles undergo same displacement then work done by Newton’s 3 rd law pair forces on them is of opposite sign and equal magnitude.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 941

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 7 m rebounds only 1.6 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

2.45

b.

0.466

c.

1.26

d.

0.771

Question number: 942

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body of mass m is released from the top of a rough inclined plane as shown in figure. If the frictional force be F, then body will reach the bottom with a velocity

Inclined plane with body of mass m

Inclined Plane With Body of Mass M

A body of Mass on inclined plane – velocity to reach the bottom is calculated

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

None of the above

f Page
Sign In