AIIMS Physics: Questions 422 - 425 of 500

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Question number: 422

» Properties of Solids & Liquids » Pressure Due to a Fluid Column

MCQ▾

Question

A common hydrometer, which is graduated from 0 to 10 downwards, reads zero when floating in water and 10 when floating in liquid of specific gravity 1.4. In an unknown liquid it reads 7, the specific gravity of the unknown liquid is –

Choices

Choice (4) Response
a.

1.4

b.

1.3

c.

1.2

d.

1.6

Question number: 423

» Ray Optics » Snell's Law

MCQ▾

Question

What is the velocity of the light in the medium if sinθi=0.707,sinθr=0.500, and the velocity of light in a vacuum is 3.0×108ms ?

Choices

Choice (4) Response
a.

4.2×108ms

b.

2.1×108ms

c.

1.4×108ms

d.

2.8×108ms

Question number: 424

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

A stone tied to the end of 15 cm long string is whirled in a horizontal circle. If the centripetal acceleration is 9.6ms2 , its angular speed in radians is –

Choices

Choice (4) Response
a.

227

b.

8

c.

9

d.

15

Question number: 425

» Laws of Motion » Force and Inertia

MCQ▾

Question

A box is put on a scale which is adjusted to read zero, when the box is empty. A stream of pebbles is then poured into the base from a height 20m above its bottom at a rate of 5 pebbles per second. Each pebble has a mass 10g. If the pebbles collide with the box such that they immediately come to rest after collision, then the scale reading at time 5sec after the pebbles begin to fill the box is – (Takeg=10ms2)

Choices

Choice (4) Response
a.

3.5N

b.

7N

c.

35N

d.

70N

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