Question # 1

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

Atmospheric pressure will increased if we move on earth:

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Upward

Downward

Left

right

Convection of heat is the process of heat transfer due to the:

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

In measurement 1.032 numbers of significant figure are.

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1

2

3

4

The rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

On Celsius scale, temperature 300 K will be:

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26°C

25°C

24°C

27°C

Gravitational constant depends on:

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Medium

Force

Weight

It does not depend son anything

Land breeze from land to sea during:

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Day

Night

Afternoon

Morning

Rate of doing work is called:

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Energy

Torque

Power

Moment

GPS consists of __________ earth satellites.

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30

2

7

24

Independent quantities are taken on

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- x - axis

x -axis

-y-axis

y-axis

Thye Water waves obey the laws of

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Reflection

Refraction

Diffraction

All of these

The maximum displacement from mean position is called:

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Maximum height

Time period

Amplitude

Intervel

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

The speed of sound in are water at 25°C is:

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1530ms-1

1531ms-1

1560ms-1

1570ms-1

The unit of intensity of sound:

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wm^-1

wm

wm^-2

wm^-3

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

The SI the unit of charge is:

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Jpi;e

Volt

Coulomb

Watt

To see from submarine the ship at the surface of water , we use:

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Telescope

Microscope

Peri scope

Prism

electroscope can also be charges by the process of:

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electrostatics

electricity

convection

conduction

How Galvanometer is connected in circuit to detect current:

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In series

In parallel

Fixed

Variable

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Average acceleration is a

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Scalar quantity

Vector quantity

(-) ve quantity

None of these

When the body moves with constant acceleration the velocity time graph is

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Parabola

Hyperbola

Straight line

Curve

According to Huygen's principle the points on primary wave front can be considered as

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Secondary wavelets

Ray of light

Source of light

None of these

One complete round trip of a body is called

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Displacement

Time period

Vibration

Frequency

When a vector is multiplied by a (-)ve number its direction

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Remains constant

Reversed

Change by 90°

None of these

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

The unit of co efficient of viscosity in S.I system

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Kg -1 ms-1

Kg m-1 s-1

kg -1 m-1

Kg ms-1

The experimental value for the velocity of sound in air is

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233 m-sec^-1

333 m-sec^-1

433 m-sec^-1

533 m-sec^-1

If velocity time graph is parallel to time axis, then acceleration of moving body will be.

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Maximum

Positive

Zero

Negative

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

Resistance of choke is

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zero

Large

Very small

Infinite

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

In the equation if f₂ > then

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For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

Impedance is denoted by:

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A

Z

P

Q

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞