NDA 2018 Paper 2 | Physics Question 142 | General Science

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NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The coefficient of areal expansion of a material is 1.6 $$\times$$ 10^$$-$$5 K^$$-$$1. Which one of the following gives the value of coefficient of volume expansion of this material?

0.8 $$\times$$ 10^$$-$$5 K^$$-$$1

2.4 $$\times$$ 10^$$-$$5 K^$$-$$1

3.2 $$\times$$ 10^$$-$$5 K^$$-$$1

4.8 $$\times$$ 10^$$-$$5 K^$$-$$1

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The refractive indices of two media and denoted by n₁ and n₂ and the velocities of light in these two media are respectively, v₁ and v₂. If n₂/n₁ is 1.5, then which one of the following statement is correct?

v₁ is 1.5 times v₂

v₂ is 1.5 times v₁

v₁ is equal to v₂

v₁ is 3 times v₂

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statement is correct for a plane mirror?

its focal length is zero.

The size of the image of an object placed in front of the mirror is slightly less than that of the object.

The image is virtual, erect and laterally inverted.

Its focal length is 200 cm.

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

An object is placed in front of a convex mirror. Which one of the following statement is correct?

It will never form an inverted image.

The image moves towards the focus when the object moves towards the mirror.

Depending on the position of the object with respect to the mirror, the image can be inverted and real.

The size of the image becomes larger than that of the object when the object is placed at a distance equal to half the focal length.

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Questions Asked from Marks 2.5