Question # 1

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.

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Maximum

Minimum

Zero

Negative

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

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

The Unit of decay constant.

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Second

(second)-1

m-1

mk

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

In full wave rectification number of diodes required are equal to.

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2

3

4

5

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

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The force on a charge particle moving parallel to magnetic field is:

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Maximum

Minimum

Zero

None of these

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