Question # 1

Two down and one up quarks make

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Proton

Neutron

~~photon~~

Positron

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

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

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

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

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

To convert a galvanometer into an ammeter, we connect with it a

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Shunt resistance

Low value parallel

Low value by pass resistor

All of above

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

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