Question # 1

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

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adiabatically

isothermally

isochorically

isobarically

A solenoid is a coil of wire which is:

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Short, loosely wound, cylindrical

Long, tightly wound, spherical

Long, loosely wound, cylindrical

Long, tightly wound, cylindrical

None of these

Root out of the conventional source of energy:

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Energy from biomass

Hydroelectric energy

Geothermal energy

None of these

Density of fluid is defined as:

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Its volume to mass ratio

Product of volume and mass

Its mass of volume ratio

None of these

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

The consumption of energy by a 1000 watt heter in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

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 force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the

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magnetic flux

magnetic induction

magnetic field

self inductance

Acceleration in a body is always produced in the direction of :

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Velocity

Weight

Force

Both B and C

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angle as well as velocity of projection

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

SI unit of current describes the flow of charge at the rate of

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One ampere per second

One coulomb per second

One electron per second

6.25 x 10¹⁸electrons per second

Both B and D

If the velocity time graph is a straight line parallel to time-axis, then it means that:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of above

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

When a body is performing S.H.M., its acceleration is

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inversely proportional to the displacement

directly proportional to the applied force

directly proportional to the amplitude

directly proportional to the displacement but in opposite direction

Electric field lines emerge from the charge in:

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of them

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

The special theory of relativity treats problems invoving

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inertial frame of references

accelerating frame of references

both of these

none of these

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

The inkjet printer ejects a thin stream of:

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Water

Oil

Ink

Any of above

None of these

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Electron volt is the unit of

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Potential difference

Energy

Resistance

Capacitance

The drag force acting on a spherical droplet of radius 10^-5m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10^-7m/sec. The units comes out to be:

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10^-16N

10^-14N

10^-12N

10^-10N

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