Question # 1

Volt is named after the Italian physicist:

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Faraday

Alessandro volta

Newton

Coulomb

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

The speed of sound in air at 100°C is:

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380ms-1

382ms-1

386ms-1

300ms-1

1 bel=

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0.1 dB

10 dB

100 dB

0.01 dB

The formula of time period of simple pendulum is:

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T = 2π √L/g

T = 2π (L/g)

T = 2π√1/g

T = 1/2π √L/g

Totally reflecting prism is used in:

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periscope

binoculars

periscope and binocular

telescope

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

The symbol of atomic mass number is:

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A

X

N

Z

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

The time period of mass attached with a spring can be calculated by:

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T = 2π√L/g

T = 1/T

T =2π√g/L

T = 2π√m/k

The rate of flow of charge through any cross-sectional area is called:

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potential difference

Energy

Coulomb

Electric current

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