MCQS of Physics for NTS Set 1

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In a common base transistor circuit the current gain is 0.98.On changing the emitter current by 5.00 mA, the change in collector current is:
0.196 mA
5.1 mA
2.45 mA
4.9 mA

The number of translation degrees of freedom for a diatomic gas is
5
3
6
2

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as
K four-fold,U also four-fold
K four-fold,U two-fold
K two-fold,U also two-fold

For obtaining appreciable extension the wire should be
Long and thick
Long and thin
Short and tick
Short and thin

In an ac circuit with voltage V and current 1 the power dissipated is
1/?2 VI
Depends on the phase between V and 1
1/2 VI
VI

What is the ratio of r.m.s velocity for O2 to H2?
1 : ?4
?4 : 1
1/4
4

Choose the correct statement
An ammeter should have large resistance and a voltmeter should have small resistance
An ammeter should have small resistance and a voltmeter should have large resistance
Both an ammeter and a voltmeter should have large resistance
Both an ammeter and voltmeter should have small resistance

Quantity that remains unchanged in a transformer is
Frequency
Voltage
Current
None of these

In which of the following states does the incandescent substance give continuous spectrum?
Vapours in molecular state
Vapours in atomic state
Solid or fluid in plasma state
Solid or fluid in bulk state

When sound waves travel from air to water which of these remains constant?
Frequency
Velocity
All the above
Wavelength

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