Question # 1

Air bubble in water shines because of

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Reflection

Refraction

Diffraction

Total internal reflection

A bi prism consists of.

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Two parallel glass plates

Two acute angled prisms

Two obtuse angled prisms

Two right angled prisms

In an oscillating system damping means reduction in

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Frequency

Wavelength

Amplitude

Period

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

A ball is thrown straight up What is its acceleration just before it reaches the highest point.

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Zero

slightly less than g

Exactly g

Slightly greater than g

A water wave is an example of.

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Transverse wave

Longitudinal wave

Hair wave

Shock wave

Conservation of energy means that

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Energy can be destroyed but not created

Energy can be created but not destroyed

energy cannot be created and destroyed

Energy can neither be created nor destroyed

Which vector gives the displacement from one point to another in space.

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Position vector

Unit vector

Null vector

Distance vector

The speed of the charging or discharging a capacitor depends upon the product of resistance and.

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Current

Voltage

Capacitance

Potential difference

If D1 and D2 are the powers of two lenses placed in contact then the power of the combination will be.

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D1+D2

D1-D2

D1/D2

D1 x D2

The efficiency of a diesel engine is about

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15% to 35 5

355 to 40%

45% to 655

505 to 65 %

If a body a moving with constant acceleration the velocity time graph will be a

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zig zag

Straight line

Constant value

zero value

What is the value of earth's magnetics fields.

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5 G

50 G

100 G

500 G

The are between the velocity time graph and the time axis is numerically equal to.

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Distance moved by the object

Speed of the object

Velocity of the object

Acceleration of the object

The moment of linear momentum is equal to

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Implies

Torque

Angular momentum

Couple

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

A relationship between mechanical work and heat energy was firstly established dby.

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Davy

Count Rumford

Joule

Kelvin

The presence of a magnetic field can be detected by a

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Small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

The temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

Sound of frequencies lower than 20 Hz are called.

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Supersonics

Infra sonics

Ultrasonic

Audible sound waves

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

What is the about the electric field inside a metallic sphere.

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It is zero

It varies with the shape of the conductor

It depends on the charge there

It does not charge the metallic sphere

In half wave rectifier the rms value of A.C. component of the wave is.

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More than A.C. Value

Less than D.C. value

Same as that of D.C.

Not detectable

Radioactivity is the phenomenon associated with the.

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Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

The frequency of the fundamental mode of transverse vibration of a stretched wire 1,000 mm long is 256 Hz When the wire is shortened to 400 mm at the same tension

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640 Hz

680 Hz

720 Hz

780 Hz

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

Who described an ideal heat engine in 1840

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Boyle

Saadi Carnot

Kelvin

Currie

When a posirtron is emitted it causes.

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Mass number to increase by one

mass number to decrease by one

Atomic number to decrease by one

Atomic number to increase by one

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