Question # 1

Which of the following is an insulator:

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Copper

Iron

Silk

Silver

The distance between two consecutive waves compressions or rarefactions is called:

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Focal length

Wave length

Frequency

Time period

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

Which process is involved to store charge in capacitors:

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Rubbing

Electrostatic induction

Conduction

Electromagnetic induction

V²/R=:

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Power

Energy

Voltage

Resistance

Shock absorbers in automobiles are one practical application of:

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SHM

Random motion

Damped motion

None of these

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

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Charged

Either, a,b,and c

What is the voltage across a 6Ω resistor when 3 A of current passes through it?

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2 V

9 V

18 V

36 V

The waves in which particles of the medium vibrate perpendicular to the directions waves are:

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Electromagnetic waves

Sound waves

bothe a and b

Transverse waves

The ration of external force applied on the spring to displacement is called:

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Hooke’s law

Constant

Spring constant

Force

Which statement is true about the magnetic poles?

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

Old people can not hear sound above then _____ Hz

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1000

15000

20000

10000

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