1 February 2023 physics questions with solutions

Showing 1–10 of 30 questions

• NumericmediumCircular Motion

  Two equal positive point charges are separated by distance 2a. The distance from the centre of the line joining them, on the equatorial line, where force on a test charge q₀ becomes maximum is a/√x. The value of x is ______. Image

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• NumericmediumCircular Motion

  A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains resistance R = 100 Ω and an inductor of inductive reactance X(L) = 79.6 Ω. The capacitance needed to maximize the average rate at which energy is supplied is ______ μF.

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• MCQmediumCircular Motion

  Let σ be the uniform surface charge density of two infinite thin plane sheets shown in figure. The electric fields in the three regions I, II and III are: Image

  Options

  • Option A

    E(I) = -(σ/ε₀)n̂, E(II)=0, E(III)=(σ/ε₀)n̂

  • Option B

    E(I)=0, E(II)=(σ/ε₀)n̂, E(III)=0

  • Option C

    E(I)=(σ/2ε₀)n̂, E(II)=0, E(III)=(σ/2ε₀)n̂

  • Option D

    E(I)=-(σ/ε₀)n̂, E(II)=0, E(III)=(σ/ε₀)n̂

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• MCQeasyCircular Motion

  A proton moving with one tenth of velocity of light has a certain de Broglie wavelength λ. An alpha particle having certain kinetic energy has the same de Broglie wavelength λ. The ratio of kinetic energy of proton to that of alpha particle is:

  Options

  • Option A

    2 : 1

  • Option B

    4 : 1

  • Option C

    1 : 2

  • Option D

    1 : 4

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• MCQeasyCircular Motion

  Which of the following frequencies does not belong to FM broadcast?

  Options

  • Option A

    106 MHz

  • Option B

    64 MHz

  • Option C

    99 MHz

  • Option D

    89 MHz

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• MCQmediumCircular Motion

  A mercury drop of radius 10⁻³ m is broken into 125 equal size droplets. Surface tension of mercury is 0.45 N m⁻¹. The gain in surface energy is:

  Options

  • Option A

    2.26 × 10⁻⁵ J

  • Option B

    28 × 10⁻⁵ J

  • Option C

    17.5 × 10⁻⁵ J

  • Option D

    5 × 10⁻⁵ J

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• MCQeasyCircular Motion

  A child stands on the edge of a cliff 10 m above the ground and throws a stone horizontally with an initial speed of 5 m s⁻¹. Neglecting air resistance, the speed with which the stone hits the ground is: [g = 10 m s⁻²]

  Options

  • Option A

    20 m s⁻¹

  • Option B

    15 m s⁻¹

  • Option C

    30 m s⁻¹

  • Option D

    25 m s⁻¹

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• NumericmediumCircular Motion

  A thin cylindrical rod of length 10 cm is placed horizontally on the principal axis of a concave mirror of focal length 20 cm. Its midpoint is 40 cm from the pole. The length of the image formed is x/3 cm. The value of x is ______. Image

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• MCQmediumCircular Motion

  (P + a/V²)(V - b) = RT represents an equation of state. P is pressure, V is volume, T is temperature and a, b, R are constants. The physical quantity having the same dimensional formula as b²/a is:

  Options

  • Option A

    Bulk modulus

  • Option B

    Modulus of rigidity

  • Option C

    Compressibility

  • Option D

    Energy density

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• MCQeasyCircular Motion

  Given below are two statements: Statement I: Acceleration due to gravity is different at different places on the surface of earth. Statement II: Acceleration due to gravity increases as we go down below the earth's surface. In the light of the above statements, choose the correct answer from the options given below:

  Options

  • Option A

    Both Statement I and Statement II are true

  • Option B

    Both Statement I and Statement II are false

  • Option C

    Statement I is true but Statement II is false

  • Option D

    Statement I is false but Statement II is true

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