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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
- 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 → - MCQeasyMagnetic effect of current
A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is:
Options
JEE Mains25 January 2023Morning Shift
Open question & full solution → - MCQmediumThermodynamics
The graph between two temperature scales P and Q is shown in the figure. Between upper fixed point and lower fixed point there are 150 equal divisions of scale P and 100 divisions on scale Q. The relationship for conversion between the two scales is given by :
Options
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - NumericmediumRotational Motion
I(CM) is the moment of inertia of a circular disc about an axis through its centre and perpendicular to its plane. I(AB) is its moment of inertia about a parallel axis AB at a distance 2R/3 from the centre, where R is the radius of the disc. The ratio I(AB):I(CM) is x:9. The value of x is:
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 → - NumericmediumElectrostatic
A uniform electric field of 10 N/C is created between two parallel charged plates as shown in figure. An electron enters symmetrically between the plates with kinetic energy 0.5 eV. The length of each plate is 10 cm. The angle θ of deviation of the path of electron as it comes out of the field is ___ degrees.
JEE Mains25 January 2023Morning Shift
Open question & full solution → - NumericmediumGeometrical optics
A ray of light is incident from air on a glass plate having thickness √3 cm and refractive index √2. The angle of incidence is equal to the critical angle for the glass-air interface. The lateral displacement of the ray when it passes through the plate is ___ × 10⁻² cm. (Given sin15° = 0.26)
JEE Mains25 January 2023Morning Shift
Open question & full solution → - NumericmediumGeometrical optics
An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a distance of 20 cm. The image produced by the plane mirror is 5 cm inside the mirror. The distance of the object from the lens is ____ cm.
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - 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 → - MCQmediumAtomic Structure and X-rays
The energy levels of an atom are shown in the figure. Which one of these transitions will result in the emission of a photon of wavelength 124.1 nm ? Given (h = 6.62 × 10⁻³⁴ J s)
Options
JEE Mains25 January 2023Shift 2Evening Shift
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