Question # 1

Which of the following is a non conservative force.

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Gravitational force

Air resistance

Elastic force

Tension in a string

A forward based p-n semiconductor diode is called.

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Photodiode

Photovoltaic cell

Amplifier

Ligh emitted diode

Impulse is equal to.

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F x t/2

\F x t /4

F x t

F x t /m

The wave form of SHM is a

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Sine wave

Cosine wave

Square wave

Electromagnetic wave

Two wires P and Q each of same length and the same material are connected in parallel to a battery The diameter of P is half that of Q What fraction of the total current passes through P.

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0.02

0.25

0.33

0.50

The sun appears elliptical before sunset due to

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Reflection

Refraction

Scattering

Total internal reflection

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

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Equal to the input temperature

Less than the input temperature

0 ^oC

0 K

What is the period of geostationary satellite.

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6 hours

12 hours

18 hours

24 hours

Which of the following is an electrical insulator that can be polarized by an applied electric field.

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Conductor

Condenser

Di electric

Capacitor

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

Which one is not a semiconductor.

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Go As

Ge

Sc

In

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

Neil Bohr made his three postulates in.

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1897

1905

1913

1921

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

If a resistance is connected in parallel with a galvanometer the resulting instrument is called.

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A voltmeter

An ammeter

A wattmeter

A potentiometer

If we make the magnetic field stronger the value of induced emf is.

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Decreased

Increased

Vanished

Kept constant

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be.

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16.7 ^o

19.3 ^o

29.6 ^o

39.3 ^o

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

In an oscillating system damping means reduction in

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Frequency

Wavelength

Amplitude

Period

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

The process by which nuclei emit a ,b and gama rays in order to attain stability is called.

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Radioactive disintegration

Radio activity

B decay

Radioactive transmulation

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

The scalar product of two vectors in negative when

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Vectors are parallel

Vectors are antiparallel

Vectors and perpendicular

Vectors are parallel with same magnitude

The measure of how strongly a material oppose the flow of electrical current is known as

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Electrical resistivity

Specific electrical resistivity

Volume resistivity

All of the above

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 1st condition of equilibriums satisfied if.

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Linear acceleration is zero

Angular acceleration is zero

The vector sum of all the forces is zero

The vector sum of all the torque is increase

Which is the correct statement regarding the nature of light.

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It has wave nature

It has particle nature

It has both wave and particle nature at the same time

It has wave nature sometime and particle nature at some other time.

A point mass moves through a circular arc of length 'l' and radius 'r' in time 't' what is the angular velocity about the centre of the circle.

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i/rt

r/it

2/rt

rt

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

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