Question # 1

F_x= 4 N and F_y=3N what is F?

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5N

1.5 N

16 N

9 N

Torque is a ___________ quantity.

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Vector

Scalar

Base

All of these

Earth revolves around the:

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Moon

Sun

Glaxy

None

The pressure of liquid is given by

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pg V

pg A

pgh

pg

The unit of torque is:

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N

Nm

m

m/n

The earth also completes its one revolution about its axis in.

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1 Hours

6 Hours

13 Hours

24 Hours

S.I unit of pressure is :

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Nm^-2

Newton

Joule

Watt

1 hp is equal to :

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747 W

746 W

748 W

1000 W

The altitude of geostationary orbits in which communication satellites are launched above the surface of the earth is;

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850 km

1000 km

6400 km

42300 km

A boy jumps out of a moving bus. There is danger for him to fall

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Towards the moving bus

In the direction of motion

away from the bus

Opposite to the direction of motion

Which of the following material has large specific heat?

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Copper

Ice

Water

Mercury

The distance between principal focus and pole of mirror is called:

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Principal focus

Focal length

Aperture

Image

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

Electric potential and e.m.f.

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are the same terms

are the different terms

have different units

both b and c

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

If a dielectric medium is present between two point charges them electrostatic force will be:

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Increased

Decreased

Vanishes

Remain same

We can distinguish between the notes of a piano and flute due to ………… of sound.

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Loudness

Pitch

Quality

Intensity

Capacitors are mainly used for radio frequency tuning:

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Paper capacitor

Air capacitor

Mica capacitor

Electrolytic capacitor

Joule’s law is W=

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IR/t

IRt²

IR²t

I²Rt

The value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

Hygen's principle is used for.

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Explain polarization

Locate the wave front

Find the speed of light

Find the index of refraction

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

The velocity of a free falling body just before Hattin the ground is 9.8 ms-1, the height through which is fall be

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98 m

19.6 m

4.9 m

9.8 m

The blue colour of sky is due to

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diffraction

Reflection

Polarization

Scattering

The unit of rotational K.E. is

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rAD/SEC

Js

J

Kgm2

Which material has maximum viscosity

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Glycerin

Plasma

Methanol

Water

When the amplitude of a wave is increase to doubled is energy.

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Remain the same

Increases 4 times

Increases by two times

Decreases by half

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

If the are of a circle equals its radius, then the angle subtended at the center will be

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1 degree

One rotation

One radian

Half rotation

Soap film is sunlight appears coloured due to.

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Dispersion of light

Diffraction of light

Scattering of light

Interference fo light

The moment of inertia is analogue to

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Mass

Weight

Torque

Force

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

In CRO, the output waveform of time base generator is

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Circular

Square

Sinusoidal

Saw-toothed

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1