NDA 2017 Paper 1 | Physics Question 118 | General Science

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statements is true for the relation, $$F = {{G{m_1}{m_2}} \over {{r^2}}}$$ ? (All symbols have their usual meanings.)

The quantity G depends on the local value of g, acceleration due to gravity.

The quantity G is greatest at the surface of the earth.

The quantity G is smallest at the surface of the earth.

The quantity G is a universal constant.

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

Why is it difficult to measure the coefficient of expansion of a liquid than solid?

Liquids tend to evaporate at all temperatures

Liquids conduct more heat

Liquids expand too much when heated

Their containers also expand when heated

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

If the absolute refractive indices of glass and water are $${3 \over 2}$$ and $${4 \over 3}$$ respectively, what will be the ratio of velocity of light in glass and water?

3 : 4

4 : 3

8 : 7

8 : 9

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

A positive charge +q is placed at the centre of a hollow metallic sphere of inner radius a and outer radius b. The electric field at a distance r from the centre is denoted by E. In this regard, which one of the following statements is correct?

E = 0 for a < r < b.

E = 0 for r < a.

$$E = {q \over {4\pi {\varepsilon _0}r}}$$ for a < r < b.

$$E = {q \over {4\pi {\varepsilon _0}a}}$$ for r < a.

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