Question # 1

The fundamental quantities which form the base of the SI are.

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mass, energy and time

mass, force and time

mass, length and time

mass , length and time

An ammeter can be converted into a voltmeter by connecting a

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Low resistance i series

High resistance in series

High resistance in parallel

Low resistance in parallel

The power dissipation in a pure inductive or capacitive circuit is.

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Maximum

Minimum

Zero

Infinity

The mass of proton is equal to.

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1.673 x 10^-27 kg

1.673 x 10²⁷ kg

9.1 x 10-31 kg

9.1 x 10³¹ kg

The phenomenon of interference comes about because waves obey

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the impulse momentum theorem

An inverse square law of intensity

The principle of reciprocity

The principle of super position

In the absence of air resistance all objects regardless their weights, fall with

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Same velocity

Different velocity

Same acceleration

Different acceleration

Refraction contributes to the formation of.

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Rainbows only

Mirages only

Echo

Rainbows and mirages

Which we double the voltage in a simple electric circuit, we double the

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Current

Power

Resistance

Both a and b

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

A fluid is said to be ideal if it is

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Non viscous

Non viscous and incompressible

Non viscous and with steady flow

Non viscous incompressible and has steady flow

Which of the following is basic transistor configuration.

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CB

CC

CE

All of these

The 1st condition of equilibriums satisfied if.

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Linear acceleration is zero

Angular acceleration is zero

The vector sum of all the forces is zero

The vector sum of all the torque is increase

A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be.

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9.8 J

6 J

Zero

329 J

In a purely resistive circuit carrying A.C. current the.

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Current and voltage are always in phase

Current lags the voltage by 1/4 cycle

Voltage lags the current by 1/4 cycle

Current leads the voltage by 1/2 cycle

An other name for electric P.E per unit charge is.

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Electric intensity

Electric field

Electric potential

Electric force

The main advantage of a grating over Young's apparatus is the

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Sharpness of the bright lines

Absence of dark fringes

Absence of bright fringes

Greater deviation of light

Which of the following is not a mode of radioactive decay.

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Positron emission

Electron capture

Fusion reaction

A decay

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

A vacuum diode conducts when plate

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Is negative w.r.t cathode

Is positive w.r.t. cathode

and cathode are at the same potential

Resistance is less

Plane polarized light can be produced by

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Reflection

Refraction

Scattering of light

All of these

During a thunderstorm, an observer sees a lighting flash Six second later he hears the thunder The speed of sound is 330 m s-1. Approximately how far away is the observer from the lighting.

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1/2 km

1/3 km

2 km

1/20 km

In an ideal case, when no K.E. is lost the collision is.

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Perfectly elastic

Perfectly inelastic

May or may not be elastic

May or may not be inelastic

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

When stationary waves are formed in a closed organ pipe.

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A node is formed at the closed end of the pipe

An antinode is formed at the closed end of the pipe

Each particle at the node experience zero acceleration

The maximum pressure occurs at the nodes

The polarization of an electromagnetic wave is determined by

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The magnetic field

The electric field

The electric and magnetic fields

The field direction of propagation of electromagnetic waves

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

The permeability of air is

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0.5

zero

infinity

Unity

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