Question # 1

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

The unit of conductance is

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ohm

meter

mho

ohm-meter

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized or unpolarized light

None of them

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

The ratio of forces between two tiny bodies with constant charges in air and in an insulating medium of dielectric constant k is

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1 : K

K : 1

1 : K²

K² : 1

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

A completely transparent material will be invisible in vacuum when the refractive index n is

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Unity

More than unity

Less than unity

Equal to 1.33

In projectile motion when a body is projected upward it must have

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Initial velocity

Angleθ<90°

Falling under gravity

All of these

The magnetic field due to the electric current in a conducting wire is:

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Towards the centre of the conducting wire

Circular around the conducting wire

In the direction of the electric current

In the direction opposite to the electric current

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

Which of them is not a physical quantity

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Density

Impulse

Energy

Kilogram

Amorphous solids are called

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Polymeric

Crystal

Glassy solids

All

When the light is incident on polarizing angle which of the following is completely polarized?

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Reflected light

Refracted light

Both reflected and refracted light

Neither reflected nor refracted light

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

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