# Physics (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 67 - 70 of 73

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## Question number: 67

» Physics » Light

MCQ▾

### Question

Consider the following: To protect yourself from lightening you will

I. go under a building and small trees.

III. stand on the ground.

IV. lie on the ground.

Which of the above is/are correct?

### Choices

Choice (4) Response

a.

II and III

b.

III and IV

c.

I and IV

d.

I and II

## Question number: 68

» Physics » Motion and Force

MCQ▾

### Question

An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following physical quantity (ies) is (are) non-zero and remain constant?

I. Velocity of the electron.

II. Magnitude of the momentum of the electron.

III. Force on the electron.

IV. The kinetic energy of electron.

### Choices

Choice (4) Response

a.

Only II and IV

b.

All four

c.

Only I and II

d.

Only III and IV

## Question number: 69

» Physics » Motion and Force

MCQ▾

This graph shows

### Choices

Choice (4) Response

a.

Constant acceleration

b.

Constant velocity

c.

Constant speed

d.

All of the above

## Question number: 70

» Physics » Motion and Force

MCQ▾

### Question

Consider the following statements

I. Grease is used to reduce friction in bicycle chain.

II. Ball bearings are used to reduce friction in a fan.

III. Oil can be used to increase friction in a car engine.

IV. Talc can be used to reduce friction when an object is sliding on a surface.

Which of the above statement (s) is/are correct?

### Choices

Choice (4) Response

a.

I, II, and III

b.

I, III, and IV

c.

I, II, and IV

d.

II, III, and IV

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