Question # 1

In a transistor, the central region is called

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collector

emitter

base

none of them

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

If two bodies of equal masses moving in the same direction collide elastically, then their velocities.

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Are added

Are subtracted

Do not change

Are exchanged

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are

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3, 15

4, 14

5, 13

6, 12

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

Vector A lies in the XY-plane. For what orientation will its components have opposite signs ?

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II-quadrant

III-quadrant

IV-quadrant

a and c

The right hand rule is applied to find

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The direction of a vector obtained by the vector product of two vectors

The magnitude of the vector obtained in the above manner

Neither the direction nor the magnitude

None of these

The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

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Smaller

Larger

Very large

None of these

A force of 10 N displace an object by 10 m.If work done is 50 J then direction of force makes an angle with direction of displacement.

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120°

90°

60°

None of these

The drag force increase if the speed of the object moving through a fluid

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Increases

Decreases

remains constant

None of these

Hooks law hols within

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Proportional limit

Elastic limit

Plastic limit

None

If a lens is cut into two piece perpendicular to the principal axis and only part is used the intensity of the image:

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Remains same

1/2 times

2 times

Infinite

When the magnitude of the drag force becomes equal to the weight then net force acting on the the droplet is

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Zero

Maximum

Remains the same

None of these

The original source of biomass energy is

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Moon

Sun

Geothermal

None of these

Torque is zero if

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Moment arm is zero

Body is at rest

Uniform angular acceleration

None of these

Mercury thermometer can be used to measure temperature up to

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260°C

100°C

360°C

450°C

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