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Quiz 13
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Q.1
For photoelectric effect to take place, the metal used as the cathode should have ________
High melting point
Low melting point
Low work function
Low resistance
Q.2
The unit of magnetic permeability is
Henry/meter
Henry
Weber
Weber/meter
Q.3
Which phenomena shows the particle nature of light?
Diffraction
Interference
Photoelectric effect
Polarisation
Q.4
According to the quantum theory of light, the energy of light is carried in discrete units are called
Photoelectrons
Protons
Electrons
Photons
Q.5
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by
10 MeV
100 MeV
1 MeV
0.1 MeV
Q.6
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :
3:4
5:4
5:1
3:2
Q.7
Photon is the fundamental unit/quantum of
Gravitation
Electricity
Magnetism
Light
Q.8
The energy of a photon varies directly with its
Wave length
Frequency
Speed
None of the above
Q.9
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?
The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
Both the photons have different energies.
The speeds of both the photons in vacuum are different
The frequency of X-ray photon is higher than the frequency of visible radiation photon.
Q.10
Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be
P
3P
P/3
2p/ 3
Q.11
A galvanometer can be converted into a voltmeter by connecting with it a
High resistance in parallel
Low resistance on parallel
High resistance on series
Low resistance in series
Q.12
Resistance of human body in dry condition
10 ohm
1000 ohm
10000 ohm
100000 ohm
Q.13
The threshold frequency is the frequency below which :
Photo current increases with voltage
Photo current decreases with voltage
Photo electric emission is not possible
Photo current is constant
Q.14
Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?
Barkla's experiment on scattering of X-rays
Lamb-Rutherford experiment
Geiger and Marsdens experiment on scattering of alpha particles
Bunsen and Kirchhoff's experiment
Q.15
Kirchoff's Voltage Law is known as
Conservation of Charge
Conservation Energy
Both
None of these
Q.16
In superconductors, the energy gap is due to
Electron-electron interaction
Electron-phonon interaction
Phonon-phonon interaction
Electron-photon intercation
Q.17
Electrical Pressure is also called
Current
Voltage
Resistance
Power
Q.18
The purpose of choke in a fluorescent lamp is :
To increase the current flow
To decrease the current flow
To decrease the resistance
Ro decrease the voltage momentarily
Q.19
Which of the following supports particle nature of photons ?
Diffraction
Polarization
Photoelectric effect
Interference
Q.20
Erg cross Sec is the unit of
Angular momentum
Linear Momentum
Planck's constant
Energy
Q.21
Super conductors are substances that
Offer minimum resistance to flow of electric current
Conduct electricity at low temperature
Conduct electricity at high temperature
Offer high resistance to the flow of electric current
Q.22
A galvanometer can be converted to a voltmeter by connecting
A high resistance in parallel
A high resistance in series
A low resistance in series
A low resistance in parallel
Q.23
Which of the following was the first theory of superconductivity?
Ginzburg Landau theory
London theory
Resonating valence bond theory
Quantum field theory
Q.24
An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?
Ve > Vp
Ve < Vp
Ve = Vp
Cannot be determined
Q.25
Which of the following is a device designed to protect electrical devices from voltage spikes?
Voltage unloader
Surge protector
Heat protector
Current unloader
Q.26
Kirchhoff's laws are applicable to
D.C. circuits only
A.C. circuits only
D.C. and A.C. circuits both
None of the above
Q.27
Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.
Superconductors
Semi conductors
Dielectrics
Perfect conductors
Q.28
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be
P
< P
> P
2P
Q.29
Quality of transmission depends upon
Nature of signal only
Nature of medium only
Both (A) and (B)
Neither A nor B
Q.30
Superconductors are those elements
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures
Q.31
The working of the quartz crystal in the watch is based on the
Piezo - electric Effect
Edison Effect
Photoelectric Effect
Johnson Effect
Q.32
The device which converts AC to DC is
Oscillator
Amplifier
Rectifier
None of these
Q.33
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?
8.5 A
24 A
10 A
12 A
Q.34
Choose the most appropriate answer: Natural radioactivity was discovered by
Marie Curie
Earnest Rutherford
Henry Bacquerel
Enrico Fermi
Q.35
At the center of the sun, fusion converts hydrogen into
Helium
Plutonium
Water
Carbon
Q.36
A wire carrying current is
Positively charged
Negatively charged
Neutral
Charged with a type depending upon current strength
Q.37
Circuit breaker usually operate under
After D. C. component has ceased
Transient state of short-circuit current
Sub-transient state of short-circuit current
Steady state of short-circuit current
Q.38
A device used for converting a.c. into d.c. is called
Transformer
Rectifier
Induction coil
Dynamo
Q.39
At low temperature, Lead behaves as a :
Semi conductor
Superconductor
Insulator
Conductor
Q.40
In a nuclear reactor, one of the following is used as a fuel.
Coal
Uranium
Radium
Diesel
Q.41
Alpha particle is the nucleus of an atom of
Lithium
Hydrogen
Helium
Oxygen
Q.42
Gamma rays have greatest similarity with
A-rays
B-rays
X-rays
U.V.-rays
Q.43
In a magnetic field, the direction of motion of a current carrying conductor is given by
Maxwell's right hand rule
Lenz's rule
Flemings left hand rule
Kirchoff's law
Q.44
Carbon Arc lamps are commonly used in
Cinema projectors
Photography
Vehicles
Domestic lighting
Q.45
Magnetism in materials is due to
Electrons at rest
Circular motion of electrons
Protons at rest
All neutrons at rest
Q.46
The domain theory of magnetism applies to
Aluminium
Copper
Silver
Cobalt
Q.47
The resistance of the human body (dry condition) is of the order of
10
1
Ohm
10
2
Ohm
10
3
Ohm
None of these
Q.48
Which component of an IED creates an electrical charge?
Activator
Fuse
Explosive
Power source
Q.49
The device which transfer the signal from low resistance region to high resistance region is
Diode
Transistor
Capacitor
Inductor
Q.50
The frequency of direct current is ________
Zero
50 HZ
60 HZ
100 HZ
0 h : 0 m : 1 s
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