Question # 1

If the dot product of two non zero vectors vanishes the vectors will be.

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any scalar quantity

Any negative number

Its magnitude but not direction

Its magnitude and direction

If a force 5 N applied parallel to a moment arm 5 m then torque will be

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0 N m

5 N m

10 N m

25 Nm

The decay to form other nuclides by emitting particles and electromagnetic radiations by unstable nuclides is called.

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Nuclear stability

Radioactivity

Carbon dating

Spontaneously

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

The centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

When the deforming force applied on a body produces change in volume then it is said to be

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Tensile stress

Compression stress

Shear stress

Shear modulus

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

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longer that that of visible light

Smaller than that of visible light

Same as that of visible light

Unpredictable

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

If a vehicle is to gain momentum it must

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Lose weight

Move slowly

Lose inertia

Accelerate

The gravitational potential inside a hollow spherical shell

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Increases from zero at the centre to the maximum value at the surface

Is zero throughout the inteior

Decreases from the centre

Is uniform throughout the interior

The central ring is bright in case of Newton's rigs produced by

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Reflection

Wedges

Refraction

Transmission

The law of inertia was first time formulated by

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Galileo

Newton

Kepler

Planck

The vertical component of earth's magnetics field is zero.

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At magnetic poles

At geographical poles

At magnetic equator

Everywhere

On which of the following parameters capacitance does not depend upon.

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Area of the plates

Medium between the plates

Distance between the plates

Nature of material for plates

The nib of fountain pan is split of convey ink down the nib by the phenomenon of.

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Adhesion

Cohesion

Osmosis

Capillary

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

A man in an elevator descending with an acceleration will conclude that his weight has

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Increased

Decreased

Constant value

Zero value

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

What is the mean free path in a gas.

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The distance travelled by a molecule before hitting a wall

the average distance travelled by a molecule in one second

the average distance travelled by molecules in one second

The root mean square velocity

The pressure change in a confined incompressible fluid is transmitted equally in all directions throughout the fluid and to the walls of the container This is.

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Archimedes principle

Kirchhoff's law

Pascal's law

Ampere's law

When we look at the sky during daytime the light that we see is sunlight that has been absorbed and then re radiated in different directions, This process is called.

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Scattering

Diffusion

Mirage

Rainbow

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

The relation between horse power and watt is.

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1 hp = 546 watts

1 hp = 746 watts

1 hp = 946 watts

1 hp = 1000 watts

The phenomenon of beats takes place due to

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Longitudinal waves

Transverse waves

Stationary waves

Both a and b

Soap cleans the dirty clothes because.

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Its chemical constituents are changed

Itr increases the surface tension of its solution with water

It increases the surface tension of its solution with water

It is less dense than that of water

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

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