Question # 1

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

If gravitational field is not uniform over the extended object or system of point masses the centre of mass and centreof gravity will

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Be antiparallel

Not coincide

Coincide

Be perpendicular

Candela is the SI base unit of.

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illuminance

Luminous flux

Luminous intensity

Radiant energy

Which of the following defines P.E. per unit charge.

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Electric current

Charges

Potential

Electric field

The shape of wave front depends on

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Density of medium

Shape of medium

Viscosity of medium

Length of medium

When Electric current flows through the wire it increases.

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P.E of the atoms

K.E. of the atomss

Atomic size

Number of protons

A concave mirror is used to form an image of the sun on a white screen IF the lower half of the mirror were covered with an opaque card the effect on the image on the screen would be.

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Negligible

To make the image less bright than before

To make the upper half of the image disappear

To make the lower half of the image disappear.

Any alternations product in shape length of volume where a body is subjected to some external force is called

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Deformation

Polymerization

Crystallization

Elasticity

A system of the equal and opposite point charges separated by a small distance is called.

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A capacitor

A dipole

An iinductor

A di electric

The permeability of a diamagnetic material is

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Greater than unity

Less than unity

Equal to unity

Zero

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

What happens when a 250 V, 2500 W water heater is connected to main supply using a plug fitted with a 5 A fuse.

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The fuse in the plug melts

The heartier burns out

The hearter runs at half power

The hearter works normally

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

An AND gate is.

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Equivalent to a series switching circuit.

Equivalent to a parallel switching circuit

Equivalent ot universal gate

A reciprocal of NAND gate

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

Which temperature is required for the fusion of two nuclides.

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10⁶ K

10⁷K

10⁸K

10 ⁹ K

Laser light is considered to be coherent because it consists of.

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Many wavelengths

Uncoordinated wavelengths

Coordinated waves of exactly the same wavelength

Divergent beams

A longitudinal sinusoidal wave has a wavelength of 1 cm and a period of 2s. Its wave velocity is.

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50 cm s-1

0.00t m s-1

100 cm s-1

5 m s-1

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

Which both elements are good for nuclear fission.

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Thorium an uranium

Thorium and radium

Plutonium and uranium

Plutonium and throrium

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

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Rectifier

Amplifier

Thermocouple

Transistor

The amplitude of a vibrating body at resonance place in vacuum is.

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zero

Maximum

Minimum

Infinite

Static electricity occurs when

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two metals are connected to a battery

Different insulators are rubbed together

The weather is very humid

Different conductors are rubbed together

In which of the following the speed of sound will be maximum under similar conditions.

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N2

O2

CO2

H2

Gas exert pressure on walls of the visual because gas molecules.

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Posses momentum

Have finite volume

Collide with each other

Obey gas laws

Distance between two consecutive nodes or antinodes is equal to.

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Lamda /4

Lamda

Lamda /2

2 lamda

If positive terminal of the battery is connected to n-type and negative terminal of the battery is connected to p-type then the diode is.

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Saturated

A gate

Forward biased

Revere biased

Which of the following materials has highest magnetic suscaptibility.

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Uranium

aluminium

Platinum

Sodium

When a pentavalent material like arsenic is added to a tetravalent material such as germanium, we get a.

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n-type material

p -type material

diode

super conductor

By definition a gas is said to be have undergone adiabatic compressing when

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No heat exchange occurs between the gas and its surroundings

The gas is compressed quickly

The gas is compressed slowly

The temperature of the gas remains constant

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