Question # 1

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

Blood pressure is measured by the instrument

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stethoscope

sphygmomanometer

barometer

none of them

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

For multiplication and division purposes, percentage uncertainties are:

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Add

subtracted

Multiplied

Divided

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

An oscillating body oscillates due to:

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Applied force

Restoring force

Frictional force

None of these

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

A point on the surface of the mirror where principle axis meets is called

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Focus

Centre of curvature

Pole

Aperture

The turning effect of a force is called

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Acceleration

Torque

Velocity

Momentum

When the light is incident on polarizing angle which of the following is completely polarized?

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Reflected light

Refracted light

Both reflected and refracted light

Neither reflected nor refracted light

When three forces acting at a point are in equilibrium then

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Each force is numerically equal to the sum of the other two

Each force is numerically greater than the sum of the other two

Each force is numerically greater than the difference of the other two

None of the above

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

A charge Q is divided into two parts q and Q - q and separated by a distance R.The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

Young's modulus for bone is

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10

15

20

25

Vectors are those physical quantities which requires

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Magnitude

Magnitude and directions

Direction

None of these

The mass of electrons in Me V is

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1.02 Mev/C²

0.51 Mev/C²

51 Mev/C²

102 Mev/C²

The cross product of parallel vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

A person moves 30m north then 20m east then 30√2 m south west His displacement from the original position is

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14 m south west

28 m south

10 m west

15 m east

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