Question # 1

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of these

The volume of universal gas constant R is:

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8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

Galvanometer is a device used for the detection of

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voltage

current

temperature

pressure

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

Victor de-Brogile received the Nobel prize in physics in

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1925

1929

1932

1935

The vertical component of velocity of a projectile during its motion is minimum

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at the time of projection

at the highest point

just before hitting the plane of projection

all of them

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

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)

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

A substance which have empty conduction band is called

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Conductor

Insulator

Semiconductor

None of these

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

The angular momentum of a system of particles is not conserved

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When net external force is acting upon the system

When a net external torque is acting upon the system

When a net external impulse is acting upon the system

None of these

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric field is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

Dimension of impulse is same as that of

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Force

Torque

Momentum

Angular momentum

In a semiconductor,the mobility of holes is

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Greater then electrons

Less than electrons

Equal to electrons

None

In case of interference fringes:

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Energy is destroyed at dark

Energy is created at bright fringes

Energy is transferred from dark to bright ringes

None of these

A student measured the diameter of a wire using a screw gauge with least count 0.001cm.The correct measurement is

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5.3 cm

5.32 cm

5.320 cm

5.3200 cm

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