NEET Physics: Questions 937 - 939 of 2098

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Question number: 937

» Work, Energy and Power » Elastic and Inelastic Collisions

Assertion-Reason▾

Assertion (Ꭺ)

In an elastic collision in one dimension between two bodies, total momentum remains the same before, during and after the collision.

Reason (Ꭱ)

In an elastic collision in one dimension between two bodies, total kinetic energy remains the same before, during and after the collision. [Assume external forces are absent in both the above statements],

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 938

» 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: 939

» 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

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