Question # 1

Conventionally antilock wise torque is taken as.

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Zero

Positive

Infinity

Negative

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

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0.61 m s-1

1.61 m s-1

2.00 m s-1

61.0 m s-1

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

The picture to be transmitted must be scanned because in T.V transmission light wave are first changing into.

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sound wave

Electric fluctuations

Magnetic fluctuations

Signals

Resonance phenomenon in a vibrating body

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May increase the amplitude

May decrease the amplitude

May not affected the amplitude

All of the above

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

Which of the following is the science of measuring the heat of chemical reactions or physical changes.

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Thermometry

Calorimetry

Telemetry

Photometry

Mosley's law establishes the X-rays fluorescence of target element with is.

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Atomic weight

Atomic number

Density

Lattice constant

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

A car is travelling with uniform acceleration the road has check posts every 100 m When the car passes one post , it has a speed of 10 m s-1 and when passes the next one its speed is 20 ms-1 What is the cars acceleration.

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0.67 m s-2

1.5 m s2

2.5 m s-2

6.0 m s-2

Beats occur due to

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Reflection

Refraction

interference

Diffraction

Why a positive charged object is made neutral by someone touching it.

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Electrons flow from the object

Proton flow onto the object

Protons flow from the object

Proton flow onto the object

Which term best describes the nature of light from modern view point.

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Waves

Rays

Particles

Photons

If the vector sum of all the torques is zero then

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1st condition is satisfied

2nd condition is satisfied

Centre of mass is lowered

Gravity becomes zero

Which of the following pair of physical quantities have the same dimension.

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Momentum and pressure

Energy and work

Linear and angular momentum

Force and surface tenstion

Light product by a single Nicole is

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Unpolarized

Plane polarized

Circulatory polarized

Elliptically polarized

The dioptre power of concave lens of 10 cm focal length is.

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0.1 dioptre

1.0 diopter

10 dioptre

-10 dioptre

The working of the rocket is based on the principle of.

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Electromagnetism

Conservation of momentum

Floatation

Hydraulic system

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

Mass -energy relation means that the product of mass times the square of the speed of light must be equal to.

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Torque

Momentum

Energy

Impulse

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

Critical mass is the minimum mass needed for

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Fusion

H-Bomb

Chain reaction

Binding energy

What type of current is produced by batteries.

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Direct current

Alternating current

Pulsating current

Convection current

Liquids with disordered structure frozen in are an example of

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Amorphous solids

Glassy solids

Crystalline solids

Polymeric molecules

Which type of amplifier causes minimum drain of power supply.

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Class -A

Class -B

Class-C

Class -AB

They hysteresis losses are eliminated in power transformer by using

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Low resistivity power winding

Low reflectance steel cores

Laminated steel cores

soft iron cores

The path of projectile is maximum at

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Point of lauch

Highest point

Point of landing

Both a and c

The moment of inertia of a body comes in action in

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Circular motion

Straight line motion

Curved path

zig zag motion

The main causes of power losses in a generator are.

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Pulsatng current

Eddy current

Magnetic current

Both B and C

A solid in which there is no regular arrangement of molecules.

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Amorphous solids

Glassy solids

Crystalline solids

Polymerization

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