Question # 1

A string is stretched by two equal and opposite forces 10 N each. The tension in the string is

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Zero

5N

10N

20N

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

Complete equation fy/fx =

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Sin𝜽

Cos 𝜽

Tan𝜽

Cos ec𝜽

Velocity of the body moving in upward direction from the contre of the earth.

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Increases

Decrease

Remain constnat

None of these

Which surface is best reflector of heat?

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dull black surface

coloured surface

white surface

shining slivered surface

If 1N is force and body is displaced to 1m than work is :

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2 J

1 J

3 J

4 J

Atmospheric pressure is measured by an instrument called:

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Barometer

Altimeter

Meter rod

Hydrometer

It is useful to know the location of center of gravity of a body in problem dealing with

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Motion

Equilibrium

Charge

Velocity

The brids stretch out their wings and circle in the rising currents of hot air called

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conduction

convection

radiation

thermals

Leslie's cube is a box of:

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Metal

Non-Metal

Wood

Metalloids

Plasma is in ___________ form.

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Moleculer

Kinetic

Static

Ionized

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

From which of the following we can get information almost about everything:

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Book

Teacher

Computer

Internet

The part of waves at which particles of the medium are below the normal position are called:

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Extreme positon

Crest

Trough

None of these

Who developed the 1st practical electric battery:

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Alessandro volta

Faraday

Newton

None of these

A normal eye can see near objects clearly at a distance of:

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20 cm

25 cm

30 cm

35 cm

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

The waves in which particles of the medium vibrate perpendicular to the direction of propagation of waves are called:

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Transverse waves

Longitudinal waves

Electromagnetic waves

None of these

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease the resistance of the circuit

to provide each appliance the same voltage as the power source

to provide each appliance the same current as the power source

The converter of analogue to digital signal is:

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ADC

DAC

ATDC

None of these

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

Stoke's law holds for bodies having.

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Spherical shape

Oblong shape

Rectangular shape

All shapes

Star moving towards the earth show

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Red shift

Blue shift

Green shift

Yellow shift

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

Air blows from

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High pressure to low pressure

Low pressure to high pressure

Low temperature to high temperature

High temperature to low temperature

If velocity 'v' of an object is double, then K.E. because.

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Remain same

Sixteen times

Double

Four times

A typical rocket consumes fuel about

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40000 Kgs-1

30000 Kgs-1

20000 Kg s-1

10000 Kgs-1

If a convex lens is used as a magnifying glass, whcih lens will give higher magnification that has.

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Short size

Long focal length

Large size

Short focal length

In stationary waves, the particle velocity at nodes is

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Minimum

Maximum

Zero

Constant

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1