Question # 1

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

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changed

zero

unchanged

none of these

Under normal circumstances, the volume of blood is sufficient to keep the vessels

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flatted for all times

inflated for all times

inflated for small times

none of them

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

An A.C varies as a function of

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Current

Voltage

Time

Charge

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

The resistance offered by a fluid to a solid moving inside it is called:

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Drag force

Surface force

Viscosity

None of these

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

A material having high refractive index has

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Low density

High density

Zero density

None of these

The motion of planets in the solar system is an example of the conservation of:

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Mass

Linear momentum

Angular momentum

Energy

Random error occurs when repeated measurements of the quantity under the same conditions gives

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Equal values

Different values

Increasing values

None of these

Multimode step index fibre is useful for

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short distance

long distance

both a and b

none of them

The conventional source of energy is

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Geothermal energy

Solar energy

Hydroelectric energy

None of these

Amorphous solids are more like

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crystalline solids

polymeric solids

glassy solids

any one of them

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The electrons occupying the outermost shell of an atom and the electrons occupying in the energy band are called

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Energy band

Valence band

Forbidden energy band

None of these

When passes from medium to another, deviate from its path is called

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reflection

refraction

diffraction

transmission

If the vector sum of all the external forces acting on a body is zero, then the body will be in

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rotational equilibrium

translational

complete equilibrium

all of them

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