Question # 1

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

The number of protons in any atom are always equal to the number of

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Neutrons

Electrons

Positrons

Mesoris

the number of terminals in a semiconductor diode are

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2

3

4

5

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

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