Question # 1

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

A cube with sides 2 cm long is made from a material of density 8 g cm -3 What is the density of the block is.

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0.2 g cm-3

0.5 g cm-2

2 g cm-3

5 g cm-3

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.

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n-type material

p -type material

diode

super conductor

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

If the pressure of a gas is doubled, then its thermal conductivity will

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Increases

Decreases

Remain constant

Be zero

The apaceing between fringes is a Young's double slit pattern will be increased, if we decrease the

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Wavelength of the souce light

Distance from slite to screen

Width of the slits

Separation of the slits

The length of Galilean telescope is given by

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fo + fe

fo- fe

1/fo - 1/fe

1/fo = 1/fe

The loudness of a sound deepness on its

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Wavelength

Frequency

Wave amplitude

Regularity

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

The centre of gravity of a cylinder is.

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At the intersection of medians

At the centre

At the middle point of axis

At the intersection of diagonals

The phenomenon of polarization is done by

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Selective absorption

Scattering of light

Refraction of light

Dispersion of light

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

Which circuit elements has two stable states and can be used to store information.

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Flip flop or latch

Logic gate

Oscillator

Amplifier

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

_{When a charged particle moves through a magnetic field it suffers a change in its}

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Charge

Mass

Energy

Direction of motion

A tin film of liquid is enclosed between two glass plates it is difficult to spates the plates on account of.

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Surface tension

Atmospheric pressure

Viscosity

Friction

A magnet is pushed horizontally towards a coil of insulated wire inducting an emf in the coilin which direction does the coil try to move.

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Downwards

Upwards

Away from the magnet

Towards the magnet

The amplitude of a vibrating body placed in a resistive medium.

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Increases exponentially with time

Decreases exponentially with time

Remains constant with time

Cannot be observed

Which two terminal passive electronic component implements electrical resistance as a circuit element.

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Capacitor

Inductor

Resistor

Transformer

The potential difference between two points is equal to the difference of

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Kinetic energy

potential energy

Electric current

Charge energy

The scientist who first noted that a compass needle was deflected when in the neighborhood of a current carrying wire was.

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Joseph Henry

Hans Christian Oersted

Michael Faraday

J.J. Thomson

Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.

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Spherical aberration

Chromatic aberration

Distortion

Astigmatism

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

A wire of 5 m length carries a steady current if the field inside it is 0.2 v m-1 then the potential difference will be.

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0.1 V

0.5 V

1 V

5 V

A car is travelling on a level highway at at speed of 15 m s-1. A braking force of 3,000 N brings the car to stop in 10 s The mass of the car is.

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1500 kg

2,000 kg

2,500 kg

3,000 kg

In any L-C-R circuit

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Current lags the applied voltage

Current leads the applied voltage

Current sometimes leads and sometimes lags the applied voltage

Current remains in phase with voltage

The energy in electron volts necessary to remove the most loosely bound electron from the neutral atom is known as.

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Faraday energy

Wave number

Ionization Potential

Excitation potential

Waves that have the same direction of vibration as their direction of travel are.

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Longitudinal waves

Transverse wave

Standing waves

hair wave

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