Question # 1

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

The current produced by moving a loop of wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

An alpha particle has a charge of

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+2e

-2e

-e

+3e

One coulomb per second is equal to

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One volt

One ampere

One hom

One henry

The resistivity of a substance depends upon the

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length

mass

area

temperature

A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:

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Zero to 3 N

1 N to 13 N

13 N to 3 N

None of these

The density of human blood is equal to that of

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Oil

Glycerin

Honey

Water

The multi-mode step index optical fibre, the central core has

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high refractive index and low density

low refractive index and density

low refractive index and low density

high refractive index and high density

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

Human body is composed of particles to produce electric force are

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Atoms

Molecules

Charges

All of them

Wavelength of light, on the average, is given by

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10^-14m

10^-10m

10^-6m

10^-4m

Breaking load for units area of cross-section of a wire is called:

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Tensile strength

Ductibility

Yield point

Breaking stress

Proportion of light in an optical fibre requires that the light-should be within the fibre

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Very little confined

Largely confined

Totally confined

None of these

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m^-2

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50 m

10 m

5 m

1 m

The phenomenon of blending of around edges of an obstacle is called:

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Interfarance

Defraction

Polorisation

None of above

In Young s double slit experiment the separation between the slits in halved and the distance between the slits and the screen is doubled the fringe with will

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Be doubled

Be quadrupled

Remain the same

Be halved

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