1 February 2023 physics questions with solutions

Showing 1–10 of 29 questions

• NumericmediumGeometrical opticsspherical mirror

  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 ______.

  

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• MCQeasyKinematics part-2 Projectile MotionProjectile from height

  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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• MCQeasyPhotoelectric effect and dual nature of matterdebroglie duel nature of light

  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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• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  If Earth has mass nine times and radius twice that of a planet P, then (vₑ/3)√x m s⁻¹ will be the minimum velocity required by a rocket to escape from gravitational force of P, where vₑ is escape velocity on Earth. The value of x is:

  Options

  • Option A

    2

  • Option B

    3

  • Option C

    18

  • Option D

    1

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• MCQmediumElectrostaticelectric flux and gauss law

  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:

  

  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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• NumericmediumElectrostaticelectric charge and coulamb's law

  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 ______.

  

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• NumericeasyCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  In an experiment to find emf of a cell using a potentiometer, the null-point length for a cell of emf 1.5 V is 60 cm. If this cell is replaced by another cell of emf E, the null-point length increases by 40 cm. If E = x/10 V, the value of x is ______.

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• NumericeasyProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  A certain pressure P is applied separately to 1 litre of water and 2 litre of another liquid. Water gets compressed by 0.01% whereas the liquid gets compressed by 0.03%. The ratio of bulk modulus of water to that of liquid is 3/x. The value of x is ______.

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• MCQeasyWave Motionquestion based on string wave

  A steel wire with mass per unit length 7.0 × 10⁻³ kg m⁻¹ is under tension of 70 N. The speed of transverse waves in the wire will be:

  Options

  • Option A

    200π m s⁻¹

  • Option B

    100 m s⁻¹

  • Option C

    10 m s⁻¹

  • Option D

    50 m s⁻¹

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• NumericmediumSimple Harmonic Motionkinetic and potential energy in shm

  The amplitude of a particle executing SHM is 3 cm. The displacement at which its kinetic energy is 25% more than its potential energy is ______ cm.

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