Physics · JEE Main

JEE Main 2023 · 11 Apr 2023 Shift 1

2023120 marks30 questions

24 of its 30 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

Sit this paper against the clock, marked by its official answers, or get a new paper like it. Sign in first; practising is part of Pro.

Source: JEE (Main) 2023, Paper 1 (B.E./B.Tech), 11 Apr 2023 Shift 1, Physics, published by NTA. The official PDF

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24 questions

Q31Section A4 marks
$A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line of sight at 4 km distance from it is x \times 10⁻² m. The value of x is __________. (Let, radius of earth R = 6400 km)$
1. A $1.25$
2. B $12.5$
3. C $125$
4. D $1250$
Q33Section A4 marks
$Two radioactive elements A and B initially have same number of atoms. The half life of A is same as the average life of B. If λₐ and λᵦ are decay constants of A and B respectively, then choose the correct relation from the given options.$
1. A $λₐ ln 2 = λᵦ$
2. B $λₐ = λᵦ ln 2$
3. C $λₐ = λᵦ$
4. D $λₐ = 2λᵦ$
Q34Section A4 marks
$A metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V₀. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential becomes V₀/4. The threshold wavelength for this metallic surface will be$
1. A $4λ$
2. B $3/2 λ$
3. C $3λ$
4. D $λ/4$
Q35Section A4 marks
$The critical angle for a denser-rarer interface is 45°. The speed of light in rarer medium is 3 \times 10⁸ m/s. The speed of light in the denser medium is:$
1. A $2.12 \times 10⁸ m/s$
2. B $3.12 \times 10⁷ m/s$
3. C $5 \times 10⁷ m/s$
4. D $\sqrt2 \times 10⁸ m/s$
Q37Section A4 marks
$The electric field in an electromagnetic wave is given as E⃗ = 20 sin ω(t - x/c) ĵ NC⁻¹ where ω and c are angular frequency and velocity of electromagnetic wave respectively. The energy contained in a volume of 5 \times 10⁻⁴ m³ will be (Given ε₀ = 8.85 \times 10⁻¹² C²/Nm²)$
1. A $8\cdot85 \times 10⁻¹³ J$
2. B $88\cdot5 \times 10⁻¹³ J$
3. C $28\cdot5 \times 10⁻¹³ J$
4. D $17\cdot7 \times 10⁻¹³ J$
Q38Section A4 marks
$The free space inside a current carrying toroid is filled with a material of susceptibility 2 \times 10⁻². The percentage increase in the value of magnetic field inside the toroid will be$
1. A $2%$
2. B $0\cdot2%$
3. C $1%$
4. D $0\cdot1%$
Q39Section A4 marks
$The current sensitivity of moving coil galvanometer is increased by 25%. This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:$
1. A $+25%$
2. B $-25%$
3. C $Zero$
4. D $-50%$
Q40Section A4 marks
$Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:$
1. A $1 : 4$
2. B $4 : 1$
3. C $1 : 2$
4. D $2 : 1$

JEE Main 2023 · 11 Apr 2023 Shift 1

2023120 marks30 questions

24 of its 30 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

Sit this paper against the clock, marked by its official answers, or get a new paper like it. Sign in first; practising is part of Pro.

Source: JEE (Main) 2023, Paper 1 (B.E./B.Tech), 11 Apr 2023 Shift 1, Physics, published by NTA. The official PDF