Question # 1

Radiations present in atmosphere due to the presence of different radioactive elements are:

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Cosmic radiations

Background radiations

secondary radiations

Electromagnetic radiations

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

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380ms-1

382ms-1

386ms-1

300ms-1

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

In series combination of capacitors, each capacitor will have same:

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Voltage

Charge

Capacitance

Charge and voltage

Which technology is used in mobile phone:

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Heat

Radio

Light

Laser

Pitch of sound depends upon:

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Frequency

Amplitude

Intensity

Time period

The amount of current that can be painful is:

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0.005A

0.001A

1A

2A

The basic operations performed by a computer are:

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Arithmetic operations

Non-arithmetic operations

Logical operations

Both a and c

Radio waves are:

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Longitudinal waves

Transverse waves

Electromagnetic waves

All of these

In electrostatic all charges are in:

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The same direction

Opposite direction

Motion

Static state

the range of galvanometer to measure current is:

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few amperes

few micro amperes

few milli amperes

mega amperes

Which types of image is formed by a concave lens on a screen?

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Inverted and real

Inverted and virtual

upright and real

Upright and virtual

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