Question # 1

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

Viscosity is defined as

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the friction between fluid and its container's walls

the internal friction between two layers of fluid

the resistance to flow a fluid experiences

the extent to which outside factors effect the fluid's flow

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The A.M. transmission frequency range from

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500-1000 KHz

540-1600 KHz

300-490 KHz

900-2040 KHz

The dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

The vector representation of force experience give the direction of

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magnetic field

current

length of conductor

force

The resultant of two velocities 3 m/sec and 400 cm/sec making an angle 90° with each other is:

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20 m/sec

5 m/sec

3 m.sec

None of these

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

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Zero

Its average velocity

Its angular displacement

None of these

F = I(L x B) is a

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vector

scalar

unit vector

none of these

Radio telescope is used to gather information from

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Earth

Moon only

Far side of the universe

Sea water

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

The study of physics involves?

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Structure of space and time

Interaction of electromagnetic radiation with matter

Both of them

Chemical changes

None of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

Converse of pair production is known as

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Compton effect

annihilation of matter

photoelectric effect

none of these

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

The closed loop gain of the inverting amplifier is written as

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G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Double the size

Same size

Half the size

None of these

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