Question # 1

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

Light year is a unit of

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Time

Distance

Velocity

Intensity of light

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

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90°

180°

45°

360°

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Two forces of 10 N and 8 N are applied simultaneously to a body. the maximum value of their resultant is:

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2 N

- 2 N

18 N

36 N

Split rings act as

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Vibrator

Resistor

Motor

Commulator

Distance to nearest galaxy from earth is

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10¹⁰m

10¹⁵m

10⁴⁰m

10³⁰m

The sum of positive and negative peak values are usually written as

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P-P value

negative

zero

may be positive or negative

A succession of events which bring the system back to its initial condition is called

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reversible process

irreversible process

a cycle

none of them

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

Most practical applications of electricity involve

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Charges at rest

Charges in motion

Electrons at rest

Atoms in motion

Molecules in motion

In describing functions of digital systems, a closed switch will be shown as

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0

1

low

any one of these

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with

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maximum speed

zero speed

maximum speed

none of them

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

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

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500°C

900°C

1100°C

1300°C

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

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)

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

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2.0 x 10^-5/°C

4.0x10^-5/°C

6.0x10^-5/°C

2.33x10^-5/°C

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

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