Question # 1

During the hot summer day the vlaue of atomospheric pressure is:

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Increase

Decreases

Constant

None of these

Which following works on Pascal's law?

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Screw gauge

Vernier callipers

Hydraulic press

Wedge

The value of g on moon's surface is 1.6 ms-2. What will be the weight of a 100 kg body on the surface of the moon?

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100 N

160 N

1000 N

1600 N

In ___________ (CFC) was found reacting with ozone.

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1920s

1970s

1950s

1960s

Thermal conductivities of Lead

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23

30

35

85

In a dam the water energy is called:

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Heat energy

Electrical energy

G.P.E

Mechanical enrgy

1000 liters is equal to:

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100 m³

1 m³

1 cm³

1 mm³

The quantity of heat absorbed by the body depends upon:

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Colour of surface

Nature of surface

Shape of surface

Both a & b

1 N ___________

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1 kgms^-2

1 kg ms^-1

ms^-2

All

If Fx and Fy are rectangular components of vector F, then its direction is determined by the relation

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θ = sin-1 Fv/Fx

θ = tan-1 Fx/Fy

θ = tan Fx/Fy

θ = tan Fy/Fx

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

Bets can hear sound of frequency up to:

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100,000 Hz

25000 Hz

120,000 Hz

1000 Hz

The output of an AND gate is only 1, when:

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Both of its inputs are zero

Anyone of the two inputs is zero

Both of its inputs are 1

Anyone of the two inputs is 1

What is the amount of current passing through an electric heater, if it takes 1800C charge pass through it in 3 minute:

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16 A

10 A

100 A

0.1 A

Which gate is used for safety alarm:

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AND

NANAD

OR

NOR

The water waves obey the laws of:

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Reflection

Refraction

Diffraction

All of these

When we double the voltage in a simple electric circuit, we double the:

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Current

Power

Resistance

Both a and b

It mean position kinetic energy of the ball is:

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Minimum

Zero

Maximum

None of these

The half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

Which waves of the following has highest frequency?

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Radio waves

Micro waves

Light wave

Sound wave

The difference between the loudness of faintest audible sound and loudness of another sound is called:

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Pitch of sound

Quality of sound

Sound level

Intensity of sound

The process by which electrons are emitted by a hot metal surface is known as:

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Boiling

Evaporation

Conduction

Thermionic emission

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

A 2 meter of high tank is full of water. If a hole appears at its middle, then the speed of efflux is.

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4.4 ms-1

10 ms-1

6.2 ms-1

20 ms-1

The formula of centripetal acceleration is

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Which of the following is not directed along the fixed axis of rotation.

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Angular displacement

Angular momentum

Centripetal acceleration

Angular acceleration

Not change in entropy of a system after one complete Carnot cycle is.

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Positive

Negative

Zero

None of these

Michelson's interferometer can be used ot find the

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Velocity of light

Wavelength of light

Velocity of sound

Wavelength of sound

Time period of simple pendulum only depends on

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Mass

Amplitude

Density

Length

A man of 1 kg is freefalling. The force of gravity is

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1 N

9.8 N

0.5 N

Zero

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

Average acceleration is a

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Scalar quantity

Vector quantity

(-) ve quantity

None of these

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

Radio frequency choke is

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Iron cored

Air Cored

Air as well as iron cored

None of these

Young's modulus for water's is

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Zero

1

2

3

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to:

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Infinite energy

Maximum energy

Minimum energy

Zero energy

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A