# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 165 - 169 of 285

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## Question 165

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### Question

MCQ▾

Two bodies of masses and are moving along the same line and direction with velocity of and , respectively. They collide and after the collision, the first body moves at a velocity of . Determine the velocity of the second body.

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Choice (4)Response

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b.

c.

d.

## Question 166

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### Question

MCQ▾

A bullet penetrate in a block up to 32 cm and its velocity decreased to . Then the additional thickness it will penetrate in cm before coming to rest is:

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Choice (4)Response

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d.

## Question 167

Physics
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### Question

MCQ▾

A girl is standing between two hills and shouted loudly. If she hear first echo after and second echo after , then the distance between two hills is:

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Choice (4)Response

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d.

## Question 168

Physics
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### Question

MCQ▾

A wire man worked at above the ground. His tool slips and falls down. He hear the sound of the tool hitting the ground after it has slipped. Find the speed of sound in air.

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Choice (4)Response

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d.

## Question 169

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### Question

MCQ▾

Two objects and having masses and , respectively are kept at a distance apart. A small object placed between , such that the net gravitational force on it, due to the objects and is zero. The distance between and is:

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Choice (4)Response

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d.