Question # 1

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

The impedance of RLC series resonance circuit at resonant frequency is

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Greater than R

Equal to R

Less than R

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

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5μF

10μF

3μF

6μF

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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Smaller

Lerger

Same

Much larger

None of these

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

If the displacement of a body executing S.H.M is plotted against time, then the curve is known as

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frequency of S.H.M

period of S.H.M

wave form

none of them

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The dimensions of force are

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[MLT^-1]

[M^oLT^-2]

[MLT^-2]

[ML⁰T^-2]

The diffraction grating is used to determine

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Intensity of light

Wavelength of light

Refractive index of prism

None of these

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

The concentration in solution can be determined by the property known as

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Solubility

Insolubility

Optical activity

None of these

Two bodies of 4 g and 16 g have same kinetic energy.What is the ratio of their momenta?

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1 : 4

1 : 2

2 : 1

4 : 1

Inkjet printer can produce

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Black and white copy

Coloured copy

Both

None of these

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

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Initial velocity

Variable velocity

Average velocity

None of these

A convex lens has focal length F.An object is placed at P then

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Image is formed at + ∞ and is real

Image is formed at + ∞ and is virtual

Image is formed at + ∞ and is real

Image is formed at + and is virtual

A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is

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F

2F

4F

8F

The potential energy per unit charge is the unit of

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Flux

Electric intensity

Potential difference

None of these

Sunset makes sky appears reddish because of:

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Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

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