NDA 2018 Paper 2 | Physics Question 141 | General Science

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A ball is released from rest and rolls down an inclined plane as shown in the following figure, requiring 4 s to cover a distance of 100 cm along the plane

Image

Which one of the following is the correct value of angle $$\theta$$ that the plane makes with the horizontal ? (g = 1000 cm/s²)

$$\theta$$ = sin^$$-$$1 (1/98)

$$\theta$$ = sin^$$-$$1 (1/20)

$$\theta$$ = sin^$$-$$1 (1/80)

$$\theta$$ = sin^$$-$$1 (1/100)

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.