Practice Questions

Q15.A coil is placed in a magnetic field →𝐵 as shown below : → A current is induced in the coil because 𝐵 is : (1) parallel to the plane of coil and increasing with (2) outward and increasing with time time (3) outward and decreasing with time (4) parallel to the plane of coil and decreasing with time + ^j cos𝑘𝑧- 𝜔𝑡 where ^i, ^j

Q16.What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved ? (1) Both, inductive reactance and current will (2) Inductive reactance will be halved and be halved. current will be doubled.. (3) Inductive reactance will be doubled and (4) Both, inducting reactance and current will be current will be halved. doubled JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper

Q16.A 100Ω resistance, a 0. 1μF capacitor and an inductor are connected in series across a 250 V supply at variable frequency. Calculate the value of inductance of inductor at which resonance will occur. Given that the resonant frequency is 60 Hz. (1) 0. 70H (2) 70. 3 mH (3) 7. 03 × 10−5H (4) 70. 3 H

Q16.The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4π × 10−7 Hm−1. Absolute permeability of the material of the rod is (1) 4π × 10−4 Hm−1 (2) 2π × 10−4 Hm−1 (3) 3π × 10−4 Hm−1 (4) π × 10−4 Hm−1 JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper

Q17.In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern. JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) 1: 4 (2) 2: 1 (3) 3: 1 (4) 4: 1

Q17.According to Bohr atom model, in which of the following transitions will the frequency be maximum? (1) n = 3 to n = 2 (2) n = 5 to n = 4 (3) n = 4 to n = 3 (4) n = 2 to n = 1

Q17.The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is: (1) 121. 8 nm (2) 194. 8 nm (3) 490. 7 nm (4) 913. 3 nm JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper

Q17.The expected graphical representation of the variation of angle of deviation ' δ ' with angle of incidence 'i' in a prism is : (1) (2) (3) (4)

Q17.For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is : (1) Ue = Um (2) Ue > Um (3) Ue < Um (4) Ue ≠Um

Q17.If an electron is moving in the nth orbit of the hydrogen atom, then its velocity (vn) for the nth orbit is given as: (1) vn ∝n (2) vn ∝1n (3) vn ∝n2 (4) vn ∝ n21

Q17.The light waves from two coherent sources have same intensity I1 = I2 = I0. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima? (1) I0 (2) 2I0 (3) 4I0 (4) 5I0

Q17.A particle is travelling 4 times as fast as an electron. Assuming the ratio of de-Broglie wavelength of a particle to that of electron is 2 : 1, the mass of the particle is :- (1) 1 times the mass of e− (2) 8 times the mass of e− 16 (3) 16 times the mass of e− (4) 18 times the mass of e−

Q18.The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra is lying in the visible region? (1) Brackett series (2) Paschen series (3) Lyman series (4) Balmer series

Q18.In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be : (1) 1 mm (2) 0. 50 mm (3) 0. 75 mm (4) 0. 25 mm

Q18.The angle of deviation through a prism is minimum when (A) Incident ray and emergent ray are symmetric to the prism (B) The refracted ray inside the prism becomes parallel to its base (C) Angle of incidence is equal to that of the angle of emergence (D) When angle of emergence is double the angle of incidence Choose the correct answer from the options given below : (1) Statements (A),(B) and (C) are true (2) Only statement (D) is true (3) Only statements (A) and (B) are true (4) Statements (B) and (C) are true

Q18.In an electromagnetic wave, the electric field vector and magnetic field vector are given as E = E0ˆi and → B = B0ˆk, respectively. The direction of propagation of electromagnetic wave is along: (1) (ˆk) (2) ˆJ (3) (−ˆk) (4) (−ˆj)

Q18.In a photoelectric experiment, increasing the intensity of incident light: (1) increases the number of photons incident and also (2) increases the frequency of photons incident and increases the K.E. of the ejected electrons. increases the K.E. of the ejected electrons. (3) increases the number of photons incident and the (4) increases the frequency of photons incident and K.E. of the ejected electrons remains unchanged. the K.E. of the ejected electrons remains unchanged.

Q18.In Young's double slit experiment, if the source of light changes from orange to blue then: (1) the central bright fringe will become a dark (2) the distance between consecutive fringes will fringe. decrease. (3) the distance between consecutive fringes will (4) the intensity of the minima will increase. increase.

Q19.If 𝑉𝐴 and 𝑉𝐵 are the input voltages (either 5 V or 0 V) and V0 is the output voltage then the two gates represented in the following circuits 𝐴 and 𝐵 are : (1) OR and NOT Gate (2) AND and NOT Gate (3) AND and OR Gate (4) NAND and NOR Gate

Q19.Zener breakdown occurs in a p −n junction having pand n both: (1) lightly doped and have narrow depletion layer. (2) heavily doped and have wide depletion layer. (3) lightly doped and have wide depletion layer. (4) heavily doped and have narrow depletion layer.

Q19.The stopping potential in the context of photoelectric effect depends on the following property of incident electromagnetic radiation: (1) Phase (2) Intensity (3) Amplitude (4) Frequency

Q19.Which one of the following will be the output of the given circuit? (1) NOR Gate (2) NAND Gate (3) AND Gate (4) XOR Gate

Q19.For a transistor α and β are given as α = IC and β = IC . Then the correct relation between α and β will be: IE IB (1) α = 1−ββ (2) αβ = 1 (3) β = 1−αα (4) α = 1−ββ

Q19.Identify the logic operation carried out. (1) OR (2) AND (3) NOR (4) NAND

Q19.The following logic gate is equivalent to : (1) NOR Gate (2) OR Gate (3) AND Gate (4) NAND Gate