Question # 1

Which one of the following waves belongs to electromagnetic spectrum

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Radio and TV waves

Radar waves

Micro waves

All of them

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

One radian is:

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Greater than one degree

Less than one degree

Equal to degree

none of these

The maximum possible error in the reading of an instrument is ______ its least count.

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Half of

Quarter of

Equal to

Double than

In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases

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90° - 120°

20° and 140°

120° and 240°

120° and 140°

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

0.1 kg mass will be equivalent to the energy

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9 x 10¹⁵J

5 x 10⁸J

6 x 10¹⁶J

9 x 10^-16J

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

The energy stored int he water of the dam is:

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Electric energy

Kinetic energy

Potential energy

None of these

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

The fine rulings on a compact disc as a diffraction grating but each line is wide like

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0.01 μm

0.5 μm

0.05 μm

0.6 μm

The maintaining the elastic limits of any body, the relation stress to strains is called

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Hooke's law

Pascal's law

Young's law

None of them

Mathematically the first condition for equilibrium can be expressed as

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ΣF_x = 0

ΣF_y = 0

ΣFx = 0 and ΣF_y = 0

ΣFx = 0 or ΣF_y = 0

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The angular momentum of a system of particles is not conserved

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When net external force is acting upon the system

When a net external torque is acting upon the system

When a net external impulse is acting upon the system

None of these

An aircraft is moving with a velocity of 300 ms^-1.If all the forces acting on it are balanced then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

Young's modulus for copper is

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70 x 10 Nm^-2

91 x 10 Nm^-2

110 Nm^-2

None of these

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

Who proposed wave theory of light

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Huygens

Galileo

Einstein

Newton

If the distance of separation between two chares is increased,the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

If a particle covers half the circle of radius R with constant speed then

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Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

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