Question # 1

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

A traveling wave has a shape of:

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Square wave

Sine wave

Parabola

hyperbola

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 percentage of available heat energy converted into work by a diesel engine is roughly

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35 %`

40 %

35 - 40 %

25 %

For normal operation of transistor, the batteries

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V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of these

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

How many number of anodes used in electron gun

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one

two

three

six

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

Examples of physical quantities are:

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Length

Color

Effect of music

All of these

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

When quarter of a cycle is completed, the phase of vibration is:

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90°

180°

45°

360°

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

A process is a reversible process, if the entropy of the system

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increases

decreases

remains constant

none of them

Machine parts are jammed due to:

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Increasing in viscosity of lubricant

Decreasing in viscosity of lubricant

Decreasing in surface tension of lubricant

None of these

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

The ratio of the size of the image to that of object is called:

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Focal length

Aperture

Linear magnification

Principal axis

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5Ω

1.1Ω

5.0Ω

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

Surface density of charge is defined as

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Charge per unit volume

Charge per unit length

Charge per unit area

Charge per unit mass

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

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