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25 January 2023 physics questions with solutions
Browse 25 January 2023 Physics questions with solutions. Useful for JEE, NEET, and school exam revision.
Showing 1–10 of 59 questions
- NumericmediumCenter of maas , Momentum and Collision
A body of mass 1 kg collides head on elastically with a stationary body of mass 3 kg. After collision, the smaller body reverses its direction of motion and moves with a speed of 2 m/s. The initial speed of the smaller body before collision is _______ m s⁻¹.
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - MCQeasysemiconductor
Statement I : When a Si sample is doped with Boron, it becomes P type and when doped by Arsenic it becomes N-type semi conductor such that P-type has excess holes and N-type has excess electrons.
Statement II : When such P-type and N-type semi-conductors, are fused to make a junction, a current will automatically flow which can be detected with an externally connected ammeter. In the light of above statements, choose the most appropriate answer from the options given below.
Options
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - MCQeasyElectrostatic
A point charge of 10 μC is placed at the origin. At what location on the X-axis should a point charge of 40 μC be placed so that the net electric field is zero at x = 2 cm on the X-axis ?
Options
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - MCQeasyThermodynamics
A Carnot engine with efficiency 50% takes heat from a source at 600 K. In order to increase the efficiency to 70%, keeping the temperature of sink same, the new temperature of the source will be:
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MCQeasyThermodynamics
The root mean square velocity of molecules of a gas is:
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MCQmediumThermodynamics
A bowl filled with very hot soup cools from 98°C to 86°C in 2 minutes when the room temperature is 22°C. How long will it take to cool from 75°C to 69°C?
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MatchmediumMagnetic effect of current
Match List I (current configuration) with List II (magnetic field at point O). Image
List 1
(A)
(B)
(C)
(D)
List 2
I. B₀ = μ₀I(π + 2)/(4πr)
II. B₀ = μ₀I/(4r)
III. B₀ = μ₀I(π - 1)/(2πr)
IV. B₀ = μ₀I(π + 1)/(4πr)
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MCQmediumCircular Motion
A car is moving with a constant speed of 20 m/s in a circular horizontal track of radius 40 m. A bob is suspended from the roof of the car by a massless string. The angle made by the string with the vertical will be: (Take g = 10 m/s²)
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MCQmediumGravitation
A body of mass m is taken from earth surface to the height h equal to twice the radius of earth Rₑ, the increase in potential energy will be : (g = acceleration due to gravity on the surface of Earth)
Options
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - MatcheasyUnit dimension and error
Match List I with List II
List 1
(A) Surface tension
(B) Pressure
(C) Viscosity
(D) Impulse
List 2
I. kg m⁻¹ s⁻¹
II. kg m s⁻¹
III. kg m⁻¹ s⁻²
IV. kg s⁻²
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution →