Question # 1

If mass of 10 gm is suspended from a spring of K=0.8 Nm^-1then the extension will be:

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10 cm

1 m

10 mn

None of these

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

Majority charge carriers in the p-region of p-n junction are:

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electrons

positrons

Holes

Neutrons

None of these

To designate the voltage as low or 0 by a logic gate, the specified minimum value is:

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0.2 volt

0.8 volt

0 volt

2.0 volt

5.0 volt

The earth’s potential and potential at infinity are taken:

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Equal

Zero

First is greater than the second

Second is greater than the first

Both (A) and (B)

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none of them

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

The expression of Hook's law is

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F=ma

F=kx

F= -kx

-kx=ma

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

The information from far side of the universe are gathered by:

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Radio telescope

Microscope

Telescope

Spectro scope

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

A particle moving uniformly along circle its projection along diameter performs

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Linear motion

Projectile motion

SHM

Rotatory motion

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

The value of relative permittivity of different dielectrics are

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Equal

Different

Greater than one

Smaller than one

Both B and C

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

The straight current carrying conductor experiences maximum force in a uniform magnetic field when it is placed

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parallel to the field

Perpendicular to the field

At an angle of 45 to the field

None of the above

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

The SI unit of magnetic induction is tesla which is equal to

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Newton/ampere-meter or N/A-m

Newton/ampere²-meter or N/A²-m

Newton/ampere²-meter² or N/A²-m²

Newton/ampere²-meter²or N/A²-m²

The circuit in which current and voltage are in phase, the power factor is

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zero

1

negative

0.83

If we increase the distance between two plates of the capacitor, the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

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