Question # 1

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 104 gausses

1 Wb-m²= 1 tesla

All of the above

Tick the conservative force

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Tension in a string

Air resistance

Elastic spring

Frictional force

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

The ideal gas law is

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P = nRT

V = nRT

PV =RT

PV =nRT

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

Velocity time graph can never be perpendicular to time axis,it implies

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Zero acceleration

Zero velocity

Infinite acceleration

Zero displacement

The magnifying power of a compound microscope can be increased if we use objective lens of

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Large focal length

Small focal length

Same focal length

None of these

The equation PVr = Constant applies to:

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Isothermal process

Adiabatic process

Isobaric process

None of these

Systematic error refers to an effect that influences particular quantity for the measurements which are

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All

Some

None

a and b

Glare produces when light reflects from water snow and rough road surfaces when their angle of incidence is

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Small

Large

Very large

None of these

When observed by transmitted light, the central band of newton's ring system consists of:

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Bright circular ring

Dark circular ring

May be bright or dark circular ring

No interference bands

The electrical resistance of mercury disappeared below temeprature

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2.1 K

3.4 K

4.1 K

4.2 K

In which mode, the refractive index steps down form 1.52 to 1.48 at the boundary with the cladding?

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Single mode step index

multimode step index

multimode graded index

all of them

A man pushes a wall but falls to displace it.He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

Slope of displacement time graph gives

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Instantaneous velocity

Instantaneous acceleration

Work done

Force

The horizontal velocity component in projectile motion is

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Zero

Constant

Maximum

None of these

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