MCQ 11 Mark
Which logic gate is represented by the following combination of logic gates?
- ANOR
- ✓AND
- CNAND
- DOR
Answer
View full question & answer→Correct option: B.
AND
B
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MCQ 21 Mark
In a transistor in CE configuration, the ratio of power gain to voltage gain is ____________.
- A`beta//alpha`
- B`betaalpha`
- ✓`beta`
- D`alpha`
Answer
View full question & answer→Correct option: C.
`beta`
MCQ 31 Mark
The condition to convert an amplified signal into an oscillating signal is ______
- ✓$\beta A_v=+1$
- B$\beta A_v=0$
- C$\beta A_v=-1$
- D$\beta A_v=\infty$
Answer
View full question & answer→Correct option: A.
$\beta A_v=+1$
A. $\beta A_v=+1$
MCQ 41 Mark
The rate of radioactive disintegration at an instant for a radioactive sample of half-life $2.2 \times 10^9 \mathrm{~s}$ is $10^{10} \mathrm{~s}^{-1}$. The number of radioactive atoms in that sample at that instant is, ______
- A$3.17 \times 10^{20}$
- ✓$3.17 \times 10^{19}$
- C$3.17 \times 10^{17}$
- D$3.17 \times 10^{18}$
Answer
View full question & answer→Correct option: B.
$3.17 \times 10^{19}$
B
MCQ 51 Mark
The binding energy of an electron in $n^{th}$ orbit of the hydrogen atom is given by `"E"_"n" = 13.6/"n"^2 "eV."` The energy required to knock an electron from the second orbit in eV will be ____________.
- ✓3.4 eV
- B13.6 eV
- C12.1 eV
- D10.2 eV
Answer
View full question & answer→Correct option: A.
3.4 eV
A
MCQ 61 Mark
In the figure below, D and E respectively represent
- ✓Absorption line of Balmer series and the ionization potential of hydrogen.
- BAbsorption line of Balmer series and the wavelength lesser than lowest of the Lyman series.
- CSpectral line of Balmer series and the maximum wavelength of Lyman series.
- DSpectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series.
Answer
View full question & answer→Correct option: A.
Absorption line of Balmer series and the ionization potential of hydrogen.
A
MCQ 71 Mark
What is the momentum of a photon having frequency $1.5 \times 10^{13} \mathrm{~Hz}$?
- A$6.6 \times 10^{-30} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
- B$3.3 \times 10^{-34} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
- ✓$3.3 \times 10^{-29} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
- D$6.6 \times 10^{-34} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
Answer
View full question & answer→Correct option: C.
$3.3 \times 10^{-29} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
C. $3.3 \times 10^{-29} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$
MCQ 81 Mark
Threshold wavelength for lithium metal is 6250 Å. For photoemission, the wavelength of the incident light must be ______.
- AMore than 6250 Å
- BExactly equal to 6250 Å
- ✓Equal to or less than 6250 Å
- DEqual to or more than 6250 Å
Answer
View full question & answer→Correct option: C.
Equal to or less than 6250 Å
C
MCQ 91 Mark
The following graph shows the stopping potential $\mathrm{V}_0$ versus frequency v for photoelectric emission from two metals A and B. The slope of each of the lines gives ______
- Athe charge of an electron.
- BPlanck's constant.
- Cthe product of the charge of electron and Planck's constant.
- ✓the ratio of Planck's constant and the charge of the electron.
Answer
View full question & answer→Correct option: D.
the ratio of Planck's constant and the charge of the electron.
D. the ratio of Planck's constant and the charge of the electron.
MCQ 101 Mark
A series R-C circuit is connected to an alternating voltage source. Consider two situations:(i) When capacitor is air filled.
(ii) When capacitor is mica filled.
Current through resistor is i and voltage across capacitor is V then:
(ii) When capacitor is mica filled.
Current through resistor is i and voltage across capacitor is V then:
- A$\mathrm{V}_{\mathrm{a}}=\mathrm{V}_{\mathrm{b}}$
- ✓$\mathrm{V}_{\mathrm{a}}>\mathrm{v}_{\mathrm{b}}$
- C$\mathrm{i}_{\mathrm{a}}>\mathrm{i}_{\mathrm{b}}$
- D$\mathrm{V}_{\mathrm{a}}<\mathrm{V}_{\mathrm{b}}$
Answer
View full question & answer→Correct option: B.
$\mathrm{V}_{\mathrm{a}}>\mathrm{v}_{\mathrm{b}}$
B
MCQ 111 Mark
In an LCR circuit, at resonance ______
- Athe current is minimum.
- ✓the current and voltage are in phase.
- Cthe impedance is maximum.
- Dthe current leads the voltage by π/2.
Answer
View full question & answer→Correct option: B.
the current and voltage are in phase.
B
MCQ 121 Mark
In A.C. circuit having only capacitor, the current ______.
- Aleads the voltage by `pi` in phase
- ✓leads the voltage by `pi/2` in phase
- Clags behind the voltage by `pi` in phase
- Dlags behind the voltage by `pi/2` in phase
Answer
View full question & answer→Correct option: B.
leads the voltage by `pi/2` in phase
B
MCQ 131 Mark
The output power in step-up transformer used in practice is ______.
- Anone of these
- Bequal to the input power
- ✓less than the input power
- Dgreater than the input power
Answer
View full question & answer→Correct option: C.
less than the input power
C
MCQ 141 Mark
An e.m.f. of 10 volt is produced by a self inductance when the current changes at a steady rate from 6 A to 4 A in 1 millisecond. The value of self inductance is ____________.
- Azero
- B5000 H
- ✓5 mH
- D5 H
Answer
View full question & answer→Correct option: C.
5 mH
C
MCQ 151 Mark
Lenz's law obeys the principle of ______ conservation.
- Amomentum.
- Bmass.
- ✓energy.
- Dcharge.
Answer
View full question & answer→Correct option: C.
energy.
C
MCQ 161 Mark
Assertion: Susceptibility is defined as the ratio of intensity of magnetisation I to magnetic intensity H.
Reason: Greater the value of susceptibility, smaller the value of intensity of magnetisation I.
- AAssertion is False but, Reason is True.
- BAssertion is True, Reason is True; Reason is a correct explanation for Assertion.
- CAssertion is True, Reason is True; Reason is not a correct explanation for Assertion.
- ✓Assertion is True, Reason is False.
Answer
View full question & answer→Correct option: D.
Assertion is True, Reason is False.
D
MCQ 171 Mark
A magnet of magnetic moment $6 \mathrm{Am}^2$ weighs 65 g . The density of the material of the magnet is $6500 \mathrm{~kg} / \mathrm{m}^3$. What is the magnetization?
- A$2.5 \times 10^5 \mathrm{~A} / \mathrm{m}$
- ✓$6 \times 10^5 \mathrm{~A} / \mathrm{m}$
- C$4 \times 10^5 \mathrm{~A} / \mathrm{m}$
- D$3 \times 10^5 \mathrm{~A} / \mathrm{m}$
Answer
View full question & answer→Correct option: B.
$6 \times 10^5 \mathrm{~A} / \mathrm{m}$
B
MCQ 181 Mark
A bar magnet has coercivity $6 \times 10^3 \mathrm{Am}^{-1}$. It is desired to demagnetise it by inserting it inside a solenoid 10 cm long and having 40 turns. The current that should be sent through the solenoid is ____________.
- A2 A
- ✓15 A
- C4 A
- D6 A
Answer
View full question & answer→Correct option: B.
15 A
B
MCQ 191 Mark
A circular coil has 150 turns and a mean diameter of 20 cm. It carries a current of 10 A. What is the strength of the magnetic field at a point on its axis at a distance of 5 m from the centre of the coil?
- ✓$2.4 \pi \times 10^{-8} \mathrm{~T}$
- B$2.4 \pi \times 10^{-7} \mathrm{~T}$
- C$4 \pi \times 10^{-8} \mathrm{~T}$
- D$4 \pi \times 10^{-7} \mathrm{~T}$
Answer
View full question & answer→Correct option: A.
$2.4 \pi \times 10^{-8} \mathrm{~T}$
A
MCQ 201 Mark
Two long conductors, separated by a distance 80 cm carry current $I_1$ and $I_2$ in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 1.8 m. The new value of the force between them is ____________.
- ✓- 8 F/9
- B- F/9
- C- 8 F
- DF/3
Answer
View full question & answer→Correct option: A.
- 8 F/9
A
MCQ 211 Mark
Six very long insulated copper wires are bound together to form a cable. The currents carried by the wires are $\mathrm{I}_1=$ $+10 \mathrm{~A}, \mathrm{I}_2=-12 \mathrm{~A}, \mathrm{I}_3=+10 \mathrm{~A}, \mathrm{I}_4=+8 \mathrm{~A}, \mathrm{I}_5=-11 \mathrm{~A}$ and $\mathrm{I}_6=19 \mathrm{~A}$. The magnetic induction at a perpendicular distance of 20 cm from the cable is $\qquad$ .
- ✓24 µT
- B40 µT
- C375 µT
- D3.35 µT
Answer
View full question & answer→Correct option: A.
24 µT
A
MCQ 221 Mark
In a potentiometer experiment, when the galvanometer shows no deflection, then no current flows through ____________.
- Apotentiometer wire
- ✓galvanometer circuit
- Cbattery
- Dmain circuit
Answer
View full question & answer→Correct option: B.
galvanometer circuit
B
MCQ 231 Mark
In a Wheatstone bridge, when the potentials at points B and D are the same, then the current through the galvanometer ______
- Achanges.
- Bfalls to half the initial value.
- ✓is zero.
- Dremains constant.
Answer
View full question & answer→Correct option: C.
is zero.
C
MCQ 241 Mark
Kirchhoff's junction rule is a reflection of ____________.
- Aconservation of momentum
- ✓conservation of charges
- Cconservation of current density vector
- Dconservation of energy
Answer
View full question & answer→Correct option: B.
conservation of charges
B
MCQ 251 Mark
In Van de Graaff generator potential difference is produced which is in the order of ______
- A$10^3 \mathrm{~V}$
- B$10^2 \mathrm{~V}$
- C$10^{12} \mathrm{~V}$
- ✓$10^7 \mathrm{~V}$
Answer
View full question & answer→Correct option: D.
$10^7 \mathrm{~V}$
D
MCQ 261 Mark
A spherical conductor of radius 10 cm has a charge of $3.2 \times 10^{-7} \mathrm{C}$ distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? $(1/(4 \pi epsilon_0) = 9 xx 10^9 Nm^2 // C^2)$
- ✓$1.28 \times 10^5 \mathrm{~N} / \mathrm{C}$
- B$1.28 \times 10^4 \mathrm{~N} / \mathrm{C}$
- C$1.28 \times 10^6 \mathrm{~N} / \mathrm{C}$
- D$1.28 \times 10^7 \mathrm{~N} / \mathrm{C}$
Answer
View full question & answer→Correct option: A.
$1.28 \times 10^5 \mathrm{~N} / \mathrm{C}$
A. $1.28 \times 10^5 \mathrm{~N} / \mathrm{C}$
MCQ 271 Mark
In a single slit diffraction experiment. fir t minimum for red light (589 nm) coincides with first maximum of some other wavelength `lambda'`. The value of `lambda'` is ______.
- A3500 Å
- ✓3926 Å
- C4400 Å
- D6642 Å
Answer
View full question & answer→Correct option: B.
3926 Å
B
MCQ 281 Mark
The light waves from two independent monochromatic light sources are given by, $y_1=2 \sin \omega t$ and $y_2=3 \cos \omega t$. Then the correct statement is ____________.
- Aboth the waves are in the same phase
- ✓both the waves are incoherent
- Cboth the waves have same time period
- Dboth the waves are coherent
Answer
View full question & answer→Correct option: B.
both the waves are incoherent
B
MCQ 291 Mark
An open organ pipe produces its fundamental frequency f. When the pipe is dipped in water so that `2/5` of its length is under water, then its 5 fundamental frequency becomes ____________.
- A`8/7"f"`
- B`6/5"f"`
- C`12/5"f"`
- ✓`5/6"f"`
Answer
View full question & answer→Correct option: D.
`5/6"f"`
D
MCQ 301 Mark
Equation of a plane progressive wave is given by `"y" = 0.6 "sin"2pi ("t" - "x"/2)`. On reflection from 48. denser medium its amplitude become `2/3` of the amplitude of the incident wave. The equation of the reflected wave is ____________.
- A`"y" = 0.4 "sin"2pi ("t" + "x"/2)`
- B`"y" = 0.6 "sin"2pi ("t" + "x"/2)`
- ✓`"y" =-0.4 "sin"2pi ("t" + "x"/2)`
- D`"y" = -0.4 "sin"2pi ("t" - "x"/2)`
Answer
View full question & answer→Correct option: C.
`"y" =-0.4 "sin"2pi ("t" + "x"/2)`
C
MCQ 311 Mark
A particle is moving along a circular path of radius 6 m with a uniform speed of 8 m/s. The average acceleration when the particle completes one-half of the revolution is ______.
- A`32/(3pi)` m/`"s"^2`
- B`16/(3pi)` m/`"s"^2`
- C`48/(3pi)` m/`"s"^2`
- ✓`64/(3pi)` m/`"s"^2`
Answer
View full question & answer→Correct option: D.
`64/(3pi)` m/`"s"^2`
D
MCQ 321 Mark
The equation of a simple harmonic motion is given by, x = 8 sin (8πt) + 6 cos (8πt), the initial phase angle is ______
- ✓$\tan ^{-1}(3 / 4)$
- B$\tan ^{-1}(2 / 3)$
- C$\tan ^{-1}(5 / 8)$
- D$\tan ^{-1}(4 / 3)$
Answer
View full question & answer→Correct option: A.
$\tan ^{-1}(3 / 4)$
A
MCQ 331 Mark
120 J of heat is added to a gaseous system, whose internal energy change is 60 J, then the amount of external work done is ____________.
- A110 J
- B70 J
- ✓60 J
- D150 J
Answer
View full question & answer→Correct option: C.
60 J
C
MCQ 341 Mark
In a thermodynamic system, working substance is ideal gas. Its internal energy is in the form of ______.
- ✓kinetic energy only.
- Bkinetic and potential energy.
- Cpotential energy only.
- Dneither kinetic nor potential energy.
Answer
View full question & answer→Correct option: A.
kinetic energy only.
A
MCQ 351 Mark
Heat energy is incident on the surface at the rate of 2000 J/min. If coefficient of absorption is 0.8 and coefficient of reflection is 0.1 then heat energy transmitted by the surface in 10 minutes is ____________.
- A700 J
- B500 J
- C1000 J
- ✓2000 J
Answer
View full question & answer→Correct option: D.
2000 J
D
MCQ 361 Mark
The temperature of an ideal gas, initially at 27°C, is raised by 12°C. The rms velocity of the gas molecules will, ______
- Adecrease by nearly 1%
- Bincrease by nearly 1%
- ✓increase by nearly 2%
- Ddecrease by nearly 2%
Answer
View full question & answer→Correct option: C.
increase by nearly 2%
C
MCQ 371 Mark
Water is flowing through a tube of diameter 1 cm at 6 cm/s. Taking `eta` = $10^{-2}$ poise the flow of liquid and Reynold's number are ____________.
- Aturbulent, 9000
- Bstreamline, 60
- ✓streamline, 600
- Dturbulent, 6000
Answer
View full question & answer→Correct option: C.
streamline, 600
C
MCQ 381 Mark
The surface energy of a liquid drop is u. If it is sprayed into 1000 equal droplets, then its surface energy becomes ______.
- A1000 u
- Bu
- C100 u
- ✓10 u
Answer
View full question & answer→Correct option: D.
10 u
D
MCQ 391 Mark
A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity `omega`. Two objects of mass m are attached gently to the opposite ends of diameter of the ring. The wheel will now rotate with angular velocity ______.
- A`(omega"M")/("M + m")`
- B`(omega("M + 2m"))/"M"`
- ✓`(omega"M")/("M + 2m")`
- D`(omega("M - 2m"))/("M + 2m")`
Answer
View full question & answer→Correct option: C.
`(omega"M")/("M + 2m")`
C
MCQ 401 Mark
In negotiating curve on a flat road, a cyclist leans inwards by an angle e with the vertical in order to ______.
- Agenerate a centripetal force
- Bcounteract the centripetal force with an equal centrifugal force
- Ccounteract the centrifugal force.
- ✓counteract the torque of the frictional force that tends to topple him outwards
Answer
View full question & answer→Correct option: D.
counteract the torque of the frictional force that tends to topple him outwards
D
MCQ 411 Mark
The reading of the ammeter for a silicon diode in the given circuit is:
- ✓16.5 mA
- B0
- C11.5 mA
- D15.6 mA
Answer
View full question & answer→Correct option: A.
16.5 mA
A
MCQ 421 Mark
An energy band is, ____________.
- Aan energy gap
- Ba group of energy levels far rustinct from each other
- ✓a group of energy levels very closely spaced to each other
- Dan energy level of an electron
Answer
View full question & answer→Correct option: C.
a group of energy levels very closely spaced to each other
C
MCQ 431 Mark
An electron is moving towards X-axis. An electric field is along Y-direction then path of electron is ____________.
- Aelliptical
- Blinear
- ✓parabola
- Dcircular
Answer
View full question & answer→Correct option: C.
parabola
C
MCQ 441 Mark
+2 C and +6 C two charges are repelling each other with a force of 12 N. If each charge is given -2 C of charge, then the value of the force will be ______
- A4 N (Attractive)
- B8 N (Repulsive)
- C4 N (Repulsive)
- ✓Zero
Answer
View full question & answer→Correct option: D.
Zero
D
MCQ 451 Mark
When a glass prism is placed inside water, its dispersive power ______.
- Aremains the same
- Bincreases
- ✓decreases
- Dmay increase or decrease depending on refracting angle of prism
Answer
View full question & answer→Correct option: C.
decreases
C
MCQ 461 Mark
Two identical sounds A and B reach a point in the same phase. The resultant sound is C. The loudness of C is n dB higher than the loudness of A. The value of n is ______.
- ✓6
- B2
- C3
- D4
Answer
View full question & answer→Correct option: A.
6
A
MCQ 471 Mark
At what temperature, the reading of a fahrenheit thermometer will be three times that of celsius thermometer?
- ✓80° F
- B160° F
- C0° F
- D320° F
Answer
View full question & answer→Correct option: A.
80° F
A
MCQ 481 Mark
The mass of the moon is `1/81` of the mass of the earth. Its diameter is `1/3.7` of that of the earth. If acceleration due to gravity on the surface of the earth is $9.8 \mathrm{~m} / \mathrm{s}^2$, then the acceleration due to gravity on the surface of the moon.
- A$9.8 \times 6 \mathrm{~m} / \mathrm{s}^2$
- B$9.8 \times 3 \mathrm{~m} / \mathrm{s}^2$
- ✓'$9.8 / 6$' $\mathrm{~m} / \mathrm{s}^2$
- D'$9.8 / 3$' $\mathrm{m} / \mathrm{s}^2$
Answer
View full question & answer→Correct option: C.
'$9.8 / 6$' $\mathrm{~m} / \mathrm{s}^2$
C
MCQ 491 Mark
A block of mass 200 g moving in x direction with a constant speed of $30 \mathrm{~ms}^{-1}$, is subjected to a retarding force F = 0.1x J/m during its travel from x = 10 m to 20 m. Its final KE will be ____________.
- ✓75 J
- B50 J
- C105 J
- D175 J
Answer
View full question & answer→Correct option: A.
75 J
A
MCQ 501 Mark
If a car traveling at 48 km/h overtakes another car travelling at 30 km/h, the relative velocity of the first car with respect to another car is ______
- ✓18 km/h
- B98 km/h
- C-18 km/h
- D49 km/h
Answer
View full question & answer→Correct option: A.
18 km/h
A