NDA 2019 Paper 2 | Physics Question 191 | General Science

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NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because

the holes through the fibres are extremely fine

light rays are absorbed at the entry end and relieved at the exit end of the fibre

scattering of light occurs inside the fibre

successive total internal reflections occur as a ray moves through the fibre

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Compared to audible sound waves, ultrasound waves have

higher speed

higher frequency

Both (a) and (b)

long wavelength

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A rigid body of mass 2 kg is dropped from a stationary balloon kept at a height of 50 m from the ground. The speed of the body when it just touches the ground and the total energy when it is dropped from the balloon are respectively. (Take, acceleration due to gravity, g = 9.8 m/s²)

980 ms^$$-$$1 and 980 J

$$\sqrt {980} $$ ms^$$-$$1 and $$\sqrt {980} $$ J

980 ms^$$-$$1 and $$\sqrt {980} $$ J

$$\sqrt {980} $$ ms^$$-$$1 and 980 J

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be

318 K

45 K

62.8 K