Question # 1

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

Laser is a beam of light which is

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Monochromatic

Coherent

Unidirectional

All of these

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

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