Question # 1

As we go up the value of atmospheric pressure is

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Decreased

Increased

Remain constnat

None of these

An ideal system gives output:

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50%

60%

80%

100%

Significant figures in 0.0010 are.

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One

Two

Three

Four

On hot days cold air from sea began to move towards land:

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Sea breeze

Land breeze

Both A and B

None of these

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

Atmospheric pressure acts in:

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upward direction

Down ward direction

Opposite of force

All direction

The force acting on unit area at surface of a body is called:

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Strain

Elasticity

Force

Stress

Graph is plotted between ........ variable.

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1

2

3

4

Formula of weight is derived from which law?

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First law

Second law

Third law

Law of conservation of momentum

On Uranus the daytime temperature is ___________

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216 °C

-216 °C

-200 °C

-100 °C

Momentum is defined as the product of

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Mass and acceleration

Force and acceleration

Mass and velocity

Force and velocity

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

In there is no extension in the spring then this positon is called

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Equilibrium position

Unequilibrium

Nautral equilibrium

Stable equilibrium

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

The data stored in C.D. is.

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680 MB

650 MB

700 MB

750 MB

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

The speed of waves can be calculated by:

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Vt

d x t

f λ

Tf

Safe level of noise depends on factors:

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One

Two

Three

Four

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

The location of near point changes with

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Age

Size of the eye

Sharpness of the eye

None of these

Efficiency of steam locomotive is.

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8%

10%

9%

7%

The trajectory of a projectile is.

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Circle

Parabola

Hyperbola

Straight line

The direction of vector in space is specified by

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1- angle

2- angle

3- angle

4 - angle

The resultant of two forces 30 N and 40 N acting parallel to each other is.

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30 N

40 N

70 N

10 N

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

the wavelength of transverse wave travelling with a speed 'v' having frequency 'f' in equal to

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f/v

Vf

V/f

f/V2

An immediate source of energy for our body is:

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mango

Glucose

mushroom

meat

When a fore of 100 N is acting on an object along x-axis then its vertical component will be.

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50 N

0 N

25 N

10 N

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

If a low resistance is connected parallel to a galvanometer then galvanometer is converted.

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Ammeter

Voltammeter

Ohmmeter

Multimeter

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)