Question # 1

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

In totally reflecting prism one angle is of 90°, and other two angles are of:

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30°,30°

45°,90°

45°,45°

40°,40°

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attract a neutral charge

Repels a neutral charge

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

Two uncharged objects a and b are rubbed against each other. When object b is placed near a negatively charged object c, the two objects repel each other. Which of these statements is true about object a:

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredictable

The end of solenoid from which lines of force emerge out is called:

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North pole

South pole

North and south pole

None of these

The force on a current carrying conductor is maximum if angle between field and conductor is:

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0^o

90^o

180^o

45^o

According to Fleming's left hand rule the direction of force on the conductor is given by:

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Thumb

Fore finger

Middle finger

None of these

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

The cathode ray oscilloscope consists of main parts:

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Two

Three

Four

Five

The speed of light in water is:

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2.0x10³ ms^-1

2.5x10³ ms^-1

2.3x10⁸ ms^-1

2.3x10^-8 ms^-1

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

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