Question # 1

Positive charge can be produced by:

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Combing in hair

Rubbing glass rod on silk

By rubbing ebonite rod on wool

By rubbing glass rod wool

the resistance of an ammeter should be:

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high

very high

low

constant

The output of a NAND gate is 0 when

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Both of its inputs are 0

Both of its inputs are 1

any of its inputs is 0

any of its inputs is 1

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

The force applied on the mass attached with a spring is represented by:

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F_a

F_c

F_ext

F_s

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

At room temperature, electrons cannot escape the metal surface due to ………….. of atomic nucleus:

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Repulsive forces

Attractive forces

Gravitational forces

Electromagnetic forces

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

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

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380ms-1

382ms-1

386ms-1

300ms-1

When a Uranium (92 protons)ejects a beta particle, how many protons are left in the remaining nucleus?

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89 Protons

90 Protons

91 Protons

93 Protons

A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:

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5.0 cm

7.5 cm

15 cm

20 cm

Which is not a hardware:

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CPU

Window

Keyboard

Mouse

The intensity level of train siren is:

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150 dB

100 dB

130 dB

120 dB

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