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12th Standard Physics English Medium Free Online Test 1 mark questions 2020

12th Standard

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Physics

Time : 00:25:00 Hrs
Total Marks : 25
    Answer all the questions
    25 x 1 = 25
  1. Which charge configuration produces a uniform electric field?

    (a)

    point charge

    (b)

    uniformly charged infinite line

    (c)

    uniformly charged infinite plane

    (d)

    uniformly charged spherical shell

  2. Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is

    (a)

    1μF

    (b)

    2μF

    (c)

    3μF

    (d)

    \(\frac{1}{4}\)μF

  3. The given figure is a plot of lines of force due to two charges q1 & q2 find out the sign of charges

    (a)

    both negative

    (b)

    both positive

    (c)

    upper positive and lower negative

    (d)

    upper negative and lower positive

  4. A condenser of 2μF capacitance is charged steadily from 0 to 5 coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condensor [Q = C V ]

    (a)

    (b)

    (c)

    (d)

  5. Near a charged object A another earthed object B is placed. Charges are induced on B. If B is removed. After that the charge on A ________.

    (a)

    remains the same

    (b)

    decreases

    (c)

    increases

    (d)

    becomes zero

  6. A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.

    (a)

    400 W

    (b)

    2 W

    (c)

    480 W

    (d)

    240 W

  7. A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P2. The ratio \(\frac{P_2}{P_1}\) is ______.

    (a)

    1

    (b)

    2

    (c)

    3

    (d)

    4

  8. In an electric circuit fuse wire is connected in ________________.

    (a)

    parallel

    (b)

    star connection

    (c)

    delta connection

    (d)

    series

  9. An electron moves in a straight line inside a charged parallel plate capacitor of uniform charge density σ. The time taken by the electron to cross the parallel plate capacitor undeflected when the plates of the capacitor are kept under constant magnetic field of induction  \((\vec{B})\) is

    (a)

    \({ \varepsilon }_{ ° }\frac { elB }{ \sigma } \)

    (b)

    \({ \varepsilon }_{ ° }\frac { lB }{ \sigma {l} } \)

    (c)

    \({ \varepsilon }_{ ° }\frac { lB }{ {e}\sigma } \)

    (d)

    \({ \varepsilon }_{ ° }\frac { lB }{ \sigma } \)

  10. The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is _____.

    (a)

    1.00 m A

    (b)

    1.25 mA

    (c)

    1.50 mA

    (d)

    1.75 mA

  11. Two T.G's having reduction factor K1 and K2 are connected series and give deflections θ1and θ2 respectively. Then K1 : K_____________________.

    (a)

    θ 1 : θ 2

    (b)

    tanθ1 : tanθ2

    (c)

    θ 2 : θ 1

    (d)

    tanθ2 : tanθ1

  12. The current through a solenoid of length 0.5 m with 400 turns produces a magnetic field 10-3 tesla. The current is _______

    (a)

    2A

    (b)

    20

    (c)

    1A

    (d)

    0.5 mA

  13. The flux linked with a coil at any instant t is given by \(\Phi\)B = 10t− 50t + 250. The induced emf at t = 3s is

    (a)

    −190 V

    (b)

    −10 V

    (c)

    10 V

    (d)

    190 V

  14. Which of the following is false for electromagnetic waves

    (a)

    transverse

    (b)

    non-mechanical waves

    (c)

    longitudinal

    (d)

    produced by accelerating charges

  15. A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.

    (a)

    \(\frac{E}{c}\)

    (b)

    2\(\frac{E}{c}\)

    (c)

    Ec

    (d)

    \(\frac { E }{ { c }^{ 2 } } \)

  16. For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is, ______.

    (a)

    30o

    (b)

    45o

    (c)

    60o

    (d)

    90o

  17. Stars twinkle due to, ______.

    (a)

    reflection

    (b)

    total internal reflection

    (c)

    refraction

    (d)

    polarisation

  18. Light transmitted by Nicol prism is, _____.

    (a)

    partially polarised

    (b)

    unpolarised

    (c)

    plane polarised

    (d)

    elliptically polarised

  19. When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is _____.

    (a)

    (b)

    (c)

    \(\frac{5}{2}λ\)

    (d)

  20. Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is _____.

    (a)

    1

    (b)

    2

    (c)

    3

    (d)

    4

  21. The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li++, He+ and H is _____.

    (a)

    1:2:3

    (b)

    1:4:9

    (c)

    3:2:1

    (d)

    4:9:36

  22. If a positive half-wave rectified voltage is fed to a load resistor, for which part of a cycle there will be current flow through the load?

    (a)

    00–900

    (b)

    900–1800

    (c)

    00–1800

    (d)

    00–3600

  23. If the input to the NOT gate is A = 1011, its output is ______.

    (a)

    0100

    (b)

    1000

    (c)

    1100

    (d)

    0011

  24. The frequency range of 3 MHz to 30 MHz is used for ______.

    (a)

    Ground wave propagation

    (b)

    Space wave propagation

    (c)

    Sky wave propagation

    (d)

    Satellite communication

  25. “Sky wax” is an application of nano product in the field of _____.

    (a)

    Medicine

    (b)

    Textile

    (c)

    Sports

    (d)

    Automotive industry

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