Question # 1

Laws of motion are not valid in a system which is

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inertial

non-interial

at rest

moving with uniform velocity

All the valence electrons present in a crystal of silicon are bound in their orbits by

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Ionic bond

covalent bond

Molecular bond

Both (A) and (B)

Both (B) and (C)

Neutrons are

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positive charge

negatively charged

massless

neutral

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

To turn the transistor OFF, the base current is set:

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At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

G.P. Thomson observer experimentally that electrons and neutrons possess

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particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

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3.9

4

4.2

6

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

Conversion of chemical energy to electrical energy can be achieved by:

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Primary cell

Secondary cell

Both (A) and (B)

Photovoltaic cell

Solar cell

When a force is applied on a body, several effects are possible Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

The time required to complete on vibration is called

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frequency

total time

time period

velocity

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

The number of LED'S needed to display all the digits is:

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Four

Five

Nine

Six

Seven

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

Angular frequency 'w' is basically a characteristics of

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linear motion

circular motion

both of them

none of them

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

It is customary represent a current flowing towards the reader by a symbol

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(x)

(+)

(.)

(-)

(÷)

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

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