Online Test

Question # 1

The value of young's modulus is maximum for:

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Dimond

Copper

Ice

Mercury

Water

At the top of the trajectory of a projectile the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Antiparallel to each other

When current flows through a conductor, its temperature

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Increases

Decreases

Remains the same

May rise or fall

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

The height at which the satellite stay directly above a particular point on the surface of the earth above the equator is

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24000 km

36000 km

42000 km

None of these

A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then

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Truck will cover less distance before rest

Car will cover less distance before rest

Both will cover equal distance

None

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

Aluminium is a:

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Good insulator

Bad conductor

Both A and B

Excellent conductor

Semi conductor

In the subatomic world few things can be predicted with precision of

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50 %

75 %

100 %

None of these

An inertial frame of reference is a coordinate system in which

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Energy is conserved

Momentum is conserved

Law of inertia is valid

None of these

Among the following select the correct statement

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The rate of disintegration to directly proportional to the number of atoms present in the sample at that instant

Equal fractions disintegrate in equal intervals of time

Radioactive sample takes an infinite time ti disintegrate

All of the above

The frequency used in microwave oven is

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2000Hz

2450Hz

2450MHz

2780Hz

The SI units of acceleration is

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LT

LT^-1

LT^-2

L²T^-2

Wheatstone bridge is an instrument use to determine the

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Voltage

Current

Resistance

Unknown resistances

A stethoscope detects the instant at which the external pressure is

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Greater than systolic pressure

Equal to systolic pressure

Lower than systolic pressure

None of these

A body is in its state of stress when it is

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Displaced from its equilibrium position

Remains at rest when shape changed

Their angles change

All of them

The output of a two inputs OR gate is O only when its

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Both inputs are O

Either input is 1

Both inputs are 1

Either input is zero

Electrons are

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positively charged

negatively charged

masslesss

neutral

Alternating current instead of direct current is used in long distance electric transmission because

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It is easy to generate

Rectification is possible

Energy losses are minimum

It causes fewer accidents

The valence energy band may be either

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Completely filled

Partially filled

a and b

All of them

The examples of diamagnetic substances

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Water

Copper

Antimony

All of them

Due to radical field, a moving coil galvanometer

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Comes to rest quickly

Magnetic filed becomes strong

Movement is frequent

None of these

For motion of a simple pendulum to be simple harmonic

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Amplitude of motion will be every small

Amplitude of motion will be very large

Independent of amplitude of motion

None of these.

The materials in the form of wire or rod or plate which leads the current into or out of the electrolyte is known as

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voltmeter

resistance

electrode

current

The direction of induced current in a certain coil can easily be found by using

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Right hand rule

Faraday's law

Lenz's law

None of these

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

In case of a vibrating Pendulum if the mass of the pendulum is doubled then its time period

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Becomes one half

Becomes double

Remains same

Become one fourth

The photoelectric effect establishes that

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Light travels in the form of quanta of energy

Light travels in the form of transverse waves

Light travels in the form of longitudinal waves

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

A P-n junction cannot be used as

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Detector

Amplifier

Rectifier

All

Angular frequency 'ω' is the characteristic of circular motion, with can be use to computer the value of

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Instantaneous displacement

Instantaneous velocity

Instantaneous acceleration

a and b

The SI unit of stress is

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Nm²

Nm

dynesm^-1

N

The first law of thermodynamics defined as

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Conversion of heat energy into mechanical energy

Conversion of heat energy into vibrational energy

Conversion of heat energy into translational energy

All of these

What type of temperature coefficient of resistance are thermisters

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Negative

Positive

Neutral

Positive and negative

Energy in a wave moves because of the

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Medium

Phase

Motion of particles

None of these

Time period of a vibrating body is

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Time to take 1/2 vibration

Time to take 1 vibrations

Time for 30 vibrations

None of these

Who corrected the Newton's formula for the velocity of sound

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Young

Laplace

Kelvin

Einstein

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

Germanium have negative co-efficient of temperature its

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R_t > R_o

R_t < R_o

R_t = R_o

None of these

Under same environment the measurement of a physical quantity gives different values. The error in measurement is called

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Random error

Systematic error

Physical error

Uncertainty

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these