WorksheetsMdcat Smash Test Session
Total questions: 102
Worksheet time: 51mins
Name
Class
Date
1.
Name:
4 lines
2.
Two systems are in thermal equilibrium. The quantity which is common for them is
a)
Temperature
b)
Specific heat
c)
Momentum
d)
Heat
3.
A gas in an insulated cylinder is compressed rapidly and its internal energy increases by 25 J. Work done during this process is
a)
25J
b)
–25 J
c)
50J
d)
–50 J
4.
A thermodynamics system undergoes a process in which its internal energy decreases by 100 J and at the same time 120 J work is done on the system. Heat transfer is
a)
20J
b)
–220 J
c)
220 J
d)
–20 J
5.
The work done on the system is taken as
a)
Zero
b)
Negative
c)
Same
d)
Positive
6.
In which process the P–V indicator diagram is straight line parallel to volume axis?
a)
Isobaric
b)
Adiabatic
c)
Isothermal
d)
Isochoric
7.
If 315cal of heat is given to the system, and the system does 20cal of work, find the change in internal energy.
a)
335J
b)
295cal
c)
335cal
d)
0J
8.
CV of a gas is 8 calK -1mol-1 . Find CP/CV. Assume R = 2 calK -1mol-1
a)
1.8
b)
1.4
c)
1.25
d)
1.33
9.
In Which process all the heat supplied is converted into work done?
a)
Isothermal
b)
Isochoric
c)
Isobaric
d)
Isentropic
10.
Four students found set of CP and CV (in cal/deg mole) as given below. Which of the
following set is correct?
a)
CP=5,CV=3
b)
CV=3,CP=3
c)
CV=2,CP=1
d)
CV=4,CP=2
11.
The curve represents isothermal process is called
a)
Isotherm
b)
Adiabatic
c)
Both A and B
d)
Either A or B
12.
Consider the ratios of the heat capacities γ = Cp/Cv for the three types of ideal gases: monatomic, diatomic, and polyatomic.
a)
γ is the greatest for monatomic gases
b)
γ is the greatest for polyatomic gases
c)
γ is the same only for diatomic and polyatomic gases
d)
γ is the same only for monatomic and diatomic gases
13.
A system does 600J of work at the same time has its internal energy increased by 320J. How much heat has been supplied?
a)
600 J
b)
280 J
c)
920 J
d)
20J
14.
Two different samples have the same mass and temperature. Equal quantities of energy are absorbed as heat by each. Their final temperatures may be different because the samples have different
a)
Heat capacities
b)
Volumes
c)
Densities
d)
Thermal conductivities
15.
First law of thermodynamics can be witter as CV T = Q – P V. In a change for which Boyle’s law is observed, which of the following would necessarily zero?
a)
T
b)
Q
c)
V
d)
CV
16.
A perfect gas is compressed to 1/4 th of its original volume. The initial pressure of thegas1 atmosphere if the compression is isothermal, the final pressure in atmosphere will be
a)
4
b)
1/4
c)
16
d)
1/16
17.
select the only wrong statement?
a)
A. similar charges repel each other
b)
B. dissimilar charges attract each other
c)
C. repulsion is the sure test of electrification
d)
D. an electrically neutral body is repelled both positively and negatively charged bodies
18.
select the correct statement?
a)
A. the electric lines of force have no physical existence
b)
B. they expand laterally and contract longitudinally
c)
C. they do not cross each other and group together in dielectric
d)
D. all the above statements are true
19.
The force experience by unit positive charge placed at a point in an electric field is called:
a)
Coulomb’s force
b)
Lorentz’s force
c)
Faraday’s force
d)
Electric field intensity
20.
The electric intensity at a point 20 cm away from a charge of 2×10-5 C is
a)
4.5×10^6 N/C
b)
4.5×10^5 N/C
c)
3.5×10^5 N/C
d)
3.5×10^6 N/C
21.
A capacitor of 100 pF is charged to 100 V. The charge accumulated on the plates of the capacitor is
a)
6×10^–2C
b)
10^–6C
c)
10^–8C
d)
6×10^–4C
22.
A charge of 3C is moved from infinity to a point x in an electric field. The work done in the process is 15 J. What is the electric potential at point x.
a)
Zero
b)
5V
c)
15V
d)
45V
23.
Electric flux linked with a surface will be maximum when____________?
a)
The surface is held parallel to the electric field
b)
B. The surface is held perpendicular to the electric field
c)
C. The surface makes an angle of 45°with the field
d)
D. All of the above
24.
The electric lines of force are____________?
a)
A. imaginary
b)
B. physically existing every where
c)
C. physically existing near the charges
d)
D. depends upon case
25.
A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________
a)
A. 900 volts
b)
B. 9000 volts
c)
C. 90 volts
d)
D. zero
26.
A charge of 10-10 C between two parallel plates 1cm apart experiences a force of 10-5N. The potential difference between the plates is
a)
103V
b)
102V
c)
10V
d)
105V
27.
A 5 μF capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
a)
A. 2.5 x 10-8 C
b)
B. 10-5 C
c)
C. 103 C
d)
D. 4 x 103 C
28.
Equivalent capacitance is greater than individual capacitances in_____________?
a)
A. series combination
b)
B. parallel combination
c)
C. both series and parallel combinations
d)
D. none of above
29.
Value of εr for various dielectrics is always________________?
a)
A. Less than unity
b)
B. Equal to the unit
c)
C. Larger than unit
d)
D. No hard and fast rule
30.
In a charged capacitor the energy resides
a)
Around the edge of capacitor plates
b)
In the field between the plates
c)
On the both positive and negative plates
d)
On the positive plate
31.
A proton (mass = 1.67 10−27 kg) on entering in a vertical electric field E is balanced. Then the electric field strength is
a)
10−9 Vm−1
b)
10−7 Vm−1
c)
10+7 Vm−1
d)
10−8 Vm−1
32.
Ohm's Law is applicable only when temperature remains
a)
changing
b)
absolute zero
c)
constant
d)
None of these
33.
Formula for Power is
a)
P=IV
b)
P=V/I
c)
p= V+I
d)
p=VQ
34.
In a lamp load when more than one lamp are switched on the total resistance of the load
a)
Increases
b)
Decreases
c)
Remains same
d)
None of the above
35.
Which of the following is not unit of power
a)
horse power
b)
kilowatt
c)
kWh
d)
Nm/s
36.
Internal resistance of a battery is _____ ohm, if, E=10V , Vt=9V, I= 1A
a)
1
b)
0.1
c)
0.01
d)
None of these
37.
Maximum power delivered by battery is
a)
Pmax= E^2/4r
b)
Pmax = 4rE^2
c)
Pmax = VIT
d)
Unlimited
38.
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 ohms. If the same four wires are connected is series the effective resistance will be
a)
1 ohm
b)
2 ohm
c)
3 ohm
d)
4 ohm
39.
A fuse is placed in series with the circuit to protect against
a)
High power
b)
High voltage
c)
High current
d)
Over heating
40.
Electric current may be defined as
a)
Rate of flow of charge
b)
Rate of flow of momentum
c)
Rate of flow of power
d)
None of them
41.
An apparatus which is used to measure current voltage and resistance
a)
Multimeter
b)
Ammeter
c)
Galvanometer
d)
Voltmeter
42.
Resistivity of a conductor depends upon
a)
temperature
b)
length
c)
cross sectional area
d)
None of these
43.
If I, R and t are the current, resistance and time respectively, then according to Joule's law heat produced will be proportional to
a)
I2Rt
b)
I2Rf
c)
I2R2t
d)
I2R2t2
44.
If a cell of emf 2V and internal resistance 0.5 ohm is connected across a resistance R, the current that flows is same as that when a cell of emf 1.5 V and internal resistance 0.3 ohm is connected across the same resistor. Then R= ______ Ohm.
a)
0.3
b)
0.6
c)
0.5
d)
0.75
45.
Volts / Ampere = _________
a)
Ohm
b)
Ohm meter
c)
Pascal
d)
None of them
46.
An electrical instrument which is used to measure current passing through a circuit is called?
a)
Ammeter
b)
Voltmeter
c)
Galvanometer
d)
Avometer
47.
If a charge of 2C is moving with 5m/s enter at 30 degree in 3 T, calculate the force experienced by it
a)
10N
b)
15N
c)
20N
d)
30N
48.
Charged body attracts uncharged body by ___ induction
a)
electrostatic
b)
magnetic
c)
both a and b
d)
none of these
49.
Magnetic flux is maximum when angle is
a)
0 degree
b)
90 degree
c)
120 degree
d)
all of these
50.
Find the magnetic force when a charge 3.5C with flux density of 4 units is having a velocity of 2m/s
a)
14
b)
28
c)
7
d)
32
51.
Force experienced by charge particles in magnetic field is
a)
perpendicular to velocity
b)
perpendicular to field
c)
parallel to field
d)
perpendicular to velocity and field
52.
A circular loop of area 0.05 m^2 rotates in a uniform magnetic field of 0.2 T. If the loop rotates about its diameter which is perpendicular to the magnetic field,find flux linked with loop when its plane is inclined 60 degree to the field
a)
0.01 wb
b)
0 Wb
c)
8.66*10^-3 Wb
d)
0.86 wb
53.
Motional emf induced in a coil is dependent on
a)
Magnetic field
b)
orientation
c)
length
d)
all of these
54.
Step up transformer have _______ turns in secondary coil
a)
more
b)
less
c)
equal
d)
zero
55.
The Lenz's law refers to
a)
induced current
b)
induced potential
c)
motional emf
d)
all of these
56.
X’ is a rectangular coil consisting of a large number of turns of copper wire wound over a soft iron core in an a.c. generator. Identify X
a)
Slip rings
b)
Armature
c)
Copper brushes
d)
Field magnet
57.
The role of inductance is equivalent to
a)
inertia
b)
force
c)
energy
d)
momentum
58.
A sinusoidal current has rms value of 10A. What is the peak value of current?
a)
144.4A
b)
1.4A
c)
0.1414A
d)
14.4A
59.
Weber is the unit of______
a)
magnetic flux
b)
electric flux
c)
both a or b
d)
none of these
60.
The core of transformer is made up of
a)
hard iron
b)
Soft iron
c)
Aluminium
d)
Copper
61.
Principle of electric generator is based on
a)
biot savart's law
b)
ampere's law
c)
newton's law
d)
faraday law
62.
Face of coil having clockwise current
a)
behaves like north pole
b)
behaves like south pole
c)
becomes magnet of varying poles
d)
does not behaves like magnet
63.
Which of the following are component of half wave rectifier
a)
transformer
b)
load resistance
c)
power supply
d)
All of the above
64.
In which rectifier ripple factor is less
full wave
half wave
both a) and b)
none of them
a)
A
b)
B
c)
C
d)
D
65.
The basic purpose of filter is to
a)
minimize variation in ac signal
b)
suppress harmonics in rectified output
c)
remove ripples from the rectified output
d)
stabilize dc output voltage
66.
A full wave rectifier is operating from 50 Hz mains. Fundamental frequency of ripple will be
a)
100 Hz
b)
25Hz
c)
50Hz
d)
200Hz
67.
The principle behind the working of cathode ray oscilloscope is
a)
oscillation
b)
half wave rectification
c)
full wave rectification
d)
none of these
68.
The output voltage of a rectifier is
a)
smooth
b)
pulsating
c)
perfectly direct
d)
alternating
69.
A circuit that adds positive or negative dc voltage to an input sine wave is called
a)
Clamper
b)
clipper
c)
diode clamp
d)
limiter
70.
The number of diodes in bridge rectifier is
a)
4
b)
3
c)
2
d)
5
71.
Centre tape rectifier circuit consists of ______ diode
a)
1
b)
200%
c)
300%
d)
400%
72.
Peak voltage in the output of full wave rectifier is 10V so dc component of output voltage is
a)
10√2
b)
20/√2
c)
20/π
d)
20π
73.
In a centre tap full wave rectifier if Vm is the peak voltage across the secondary of transformer, the maximum voltage across reverse bias is
a)
Vm
b)
Vm/√2
c)
2Vm
d)
Vm/3
74.
To get a peak load voltage of 40V out of a bridge rectifier, what should be the approximate rms value of secondary voltage?
a)
0V
b)
14.4V
c)
28.3V
d)
56.6 V
75.
If the line frequency is 50 Hz, the output frequency of bridge rectifier is
a)
50Hz
b)
100Hz
c)
200Hz
d)
150Hz
76.
Ripple factor of full wave rectifier is
a)
1.21
b)
0.6
c)
0.482
d)
0.9
77.
Work function depends on
a)
Metals only
b)
Nature of surface only
c)
Both metals and nature of surface
d)
Threshold frequency
78.
Wave nature of light is proved by
a)
Polarisation
b)
Black body radiation
c)
Compton 's effect
d)
Photoelectric effect
79.
Minimum energy required for pair production is
a)
939 MeV
b)
942 MeV
c)
1.02MeV
d)
0.511MeV
80.
The fast moving elecα- particlestrons stopped by a heavy metallic target in an evacuated glass tube, give rise to the production of
a)
α- particles
b)
X-rays
c)
Laser
d)
β- particles
81.
Nucleus absorbs
a)
x rays
b)
beta rays
c)
gamma rays
d)
all of theseall of these
82.
Which of the following statements is incorrect about the photons
a)
Momentum of photon h/λ
b)
Rest mass of photon is zero
c)
photon exert no pressure
d)
Energy of photon is hν
83.
Phase difference between two particles of a medium lying between two consecutive nodes is:
a)
Zero
b)
π/2
c)
π/4
d)
π
84.
Photons of energy 10.25 eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 5.0 eV. What is the stopping voltage required for these electrons?
a)
10V
b)
8V
c)
5V
d)
4V
85.
Planck's constant is analogous to
a)
Inertia
b)
Wave nature
c)
Angular momentum
d)
Linear momentum
86.
What is the energy of a photon in a beam of infrared radiation of wavelength 1240 nm? Give your answer in eV
a)
1
b)
6.25x10^18
c)
1.6x10^-19
d)
3.6x10^6
87.
The source of x rays generation is
a)
Cu
b)
H
c)
Na
d)
Al
88.
In electron microscope image formed is
a)
2D
b)
3D
c)
1D
d)
any of these
89.
The interference of green photon to red photon will cause
a)
spectrum
b)
interference
c)
diffraction
d)
no effect
90.
If the clouds of earth behaves like a black body what will happen
a)
no light will reach on surface
b)
extra light will reach the surface
c)
nothing will happen
d)
some will reflect some will absorbed
91.
Which rays have highest ionizing power
a)
alpha
b)
beta
c)
gamma
d)
white
92.
The clouds are formed when water ___ heaT
a)
absorb
b)
release
c)
first absorb than release
d)
first release than absorb
93.
X rays are also known as
a)
slow moving invisible photons
b)
slow moving visible photons
c)
fast moving invisible photons
d)
fast moving visible photons
94.
According to Wien’s law temperature and wavelength are____ related
a)
equal
b)
inversely
c)
directly
d)
none of these
95.
The activity of a certain nuclei decreases to 15 % of its original value in 10 days. Find its half life?
a)
2 days
b)
2. days
c)
3.65 days
d)
4 days
96.
The ionization power of ____ ray is highest
a)
beta
b)
gama
c)
He-Ne laser
d)
none of these
97.
Radon-222 has 136 neutrons, how many neutrons are there in Radon-220
a)
131
b)
134
c)
136
d)
none of these
98.
A radioactive source has a half-life of 80 s. How long it will take to decay 7/8 of the source?
a)
10 sec
b)
70 sec
c)
240 sec
d)
640 sec
99.
Half life of radioactive nuclide is 20 hours. What fraction of original activity will remain after 40 hours?
a)
1/2
b)
2
c)
4
d)
¼
100.
One isotope of Uranium is U-238. Any other isotope of Uranium must have
a)
146 protons
b)
92 protons
c)
92 neutrons
d)
146 neutrons
101.
The reason that white light is not harmful radiation is thaT
a)
its speed is less than other radiations
b)
it is composed of different lights
c)
it is originated from non radioactive element
d)
none of these
102.
feedback
4 lines
100 %
