Question # 1

The symbol of atomic mass number is:

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A

X

N

Z

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 speed of waves can be calculated by:

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Vt

d x t

f λ

Tf

A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete waves in a distance of 50 cm.

The velocity of the wave is:

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53 cms^-1

60 cms^-1

750 cms^-1

1500cms^-1

Totally reflecting prism is used in:

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Periscope

Binoculars

Periscope and binocular

Telescope

Which type of energy is converted into mechanical energy in the D.C. Motor.

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Magnetic energy

Heat energy

Electrical energy

Chemical energy

In SI the unit of charge is:

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Joule

Volt

Coulomb

Watt

Which device is used to show the change in the value of current or electrical potential as a graph?

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Cathode ray tube

Electron gun

Oscilloscope

Transformer

Power of hair dryer is:

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1000 W

750 W

10 W

75 W

The equivalent resistance of a parallel combination is

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equal to sum of all resistance

is greater than the largest resistance of combination

is smaller than the smallest resistance of combination

All of these

The device which converts digital quantities into analog quantities is called:

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ADC

DAC

ACD

CAD

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

Thye Water waves obey the laws of

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Reflection

Refraction

Diffraction

All of these

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