NDA 2015 Paper 2 | Physics Question 1 | General Science

NDA 2015 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statement is correct?

The image formed by a concave mirror for an object lying at infinity is at the principal focus, highly diminished, real and inverted.

A ray of light parallel to the principal axis after reflection from a concave mirror appears to diverge from the principal focus of the mirror.

The focal length of a spherical mirror is double of its radius of curvature.

A ray of light travelling from a rarer medium to a denser medium bends away from the normal.

NDA 2015 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statement is not correct?

In steady flow of a liquid, the velocity of liquid particles reaching at a particular point is the same at all points.

Steady flow is also called streamlined flow.

In steady flow, each particle may not follow the same path as taken by a previous particle passing through that point.

Two streamlines cannot intersect with each other.

NDA 2015 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A brass ball is tied to a thin wire and swung, so as to move uniformly in a horizontal circle. Which of the following statement(s) in this regard is/are true?

1. The ball moves with constant velocity.

2. The ball moves with constant speed.

3. The ball moves with constant acceleration.

4. The magnitude of the acceleration of the ball is constant.

Select the correct answer using the codes given below.

Only 1

1 and 3

1, 2 and 4

2 and 4

NDA 2015 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Two long wires each carrying a DC current in the same direction are placed close to each other.

Which one of the following statement is correct?

The wires will attract with each other.

The wires will repel with each other.

There will be no force between the wires.