# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 39 - 42 of 253

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 253 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

## Question number: 39

Appeared in Year: 2012

MCQ▾

### Question

A clay ball of mass m and speed v strikes another metal ball of same mass m, which is at rest. They stick together after collision. The kinetic energy of the system after collision is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 40

MCQ▾

### Question

atom disintegrates to by emitting 5 alpha particle and n electrons. Here n is:

### Choices

Choice (4) Response

a.

6

b.

7

c.

3

d.

10

## Question number: 41

Appeared in Year: 2012

MCQ▾

### Question

A girl holds a book of mass m against a vertical wall with a horizontal force F using her finger so that the book does not move. The frictional force on the book by the wall is:

### Choices

Choice (4) Response

a.

Equal and opposite to the resultant of F and mg

b.

μF upwards where μ is the coefficient of static friction

c.

mg and upwards

d.

F and along the finger but pointing towards the girl

## Question number: 42

Appeared in Year: 2013

MCQ▾

### Question

A ball is thrown horizontally from a height with a certain initial velocity at time t = 0. The ball bounces repeatedly from the ground with the coefficient of restitution less than 1 as shown.

Neglect air resistance and taking the upward direction as positive, which figure qualitatively depicts the vertical component of the balls velocity (VY) as a function of time (t)?

### Choices

Choice (4) Response

a.

b.

c.

d.