Question # 1

Land and sea breezes are the result of:

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Absorption

Radiation

Conduction

Convection

Fossils fuels are usually compound of:

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Carbon

Hydrogen

Carbon & Hydrogen

None of these

Those objects which do not conduct electricity are called.

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Insulator

Semi conductor

Nil

Conduct

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

A large water reservoir keeps the temperature of nearby land moderate due to

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Low temperature of water

Low specific heat of water

Less absorption of heat

Large specific heat of water

Convention is done by ____________

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Vibration of atoms

Actual movement of particles

Same as conduction

Nil

In ___________ (CFC) was found reacting with ozone.

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1920s

1970s

1950s

1960s

Significant figures in an expression are.

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All the digits

All accurately known digits

All the accurately known digits and the first doubtful digit.

All the accurately known digits and all the doubtful digits.

In symbols, co-efficient of volume expansion is defined as

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β = ΔT/V∘ΔV

β = ΔV/ΔT

β = ΔV/V∘ΔT

β = ΔT/ΔV

It base of a right angled triangle is 3 cm and its perpendicular is 3 cm.Then its hypotenuse will be

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2 cm

4 cm

6 cm

5 cm

1 N ___________

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1 kgms^-2

1 kg ms^-1

ms^-2

All

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

What is the voltage across a 6 Ω resistor when 3 A of current passes through it:

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2 V

9V

18 V

36 V

The output of OR gate would be '0' When:

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Both of its inputs are zero

One of its two inputs is zero

Both of its inputs ar 1

Any one of its inputs is 1

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

Magnification of mirror is given by:

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m=p/q

m=q/p

m=pxq

m=1/p+q

the water waves after striking the hurdle will:

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reflect

refract

diffract

all a b and c

the resistance of an ammeter should be:

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high

very high

low

constant

____________ is always virtual in case of convex mirror.

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p

image

object

all of these

One of the isotopes of uranium is²³⁸U₉₂the number of neutrons in the isotopes is.

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92

146

238

330

As the temperature of a conductor rises, its resistance:

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Increases

Decreases

Does not change

None of these

In simple pendulum motion, restoring force is provided by:

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Air resistance

Tension in the string

Inertia

Weight of the body

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

In rotational motion the torque is equal to rate of change of

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Angular velocity

Linear momentum

Angular momentum

Angular acceleration

S.I Unit of pressure of gas is.

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Nm

N.m

N2/m

N3m

Substances that don't flow easily has

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Large co-efficient of viscosity

Small co-efficient of viscosity

Medium co-efficient of viscosity

Zero-coefficient of viscosity

The law of conservation of mass gives us

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Equation of continuity

Stock's law

Bernoulli's equation

Viscosity

The light signal in Opticla fiber must be regenerated by advice called.

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Regenerator

Generator

Repeater

Diode

Kilo watt hour is the unit of

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Power

Energy

Force

Torque

The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

The dimension of viscosity are

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[M2L-2T2]

[M-1LT-1]

[M-1L-1T]

[ML-1T-1]

Rate of change of velocity is called

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Speed

Acceleration

Displacement

Torque

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

_______ is the building block of every electronic circuit.

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Semi conductor diode

Resistor

Capacitor

Amplifier

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

When a nucleus emits alpha particle its atomic mass decreases by

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1

2

3

4

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp