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nikhil04
@nikhil04
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Joined: Aug 19, 2020
Last seen: Jan 13, 2022
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Answer to: Consider four conducting materials copper, tungsten, mercury and aluminum with resistivity ρC , ρT , ρM and ρA respectively.

Correct answer: (4) ρM > ρA > ρC Explanation: ρM = 98 x 10-8 ρA = 2.65 x 10-8 ρC = 1.724 x 10-8 ρT = 5.65 x 10-8

5 years ago
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Answer to: Train A and train B are running on parallel tracks in the opposite directions with speed of 36 km/hour and 72 km/hour, respectively.

Correct answer: (2) 29.5 ms–1 Explanation: VA = 36 km/hr = 10 m/s VB = –72 km/hr = –20 m/s Vman = – 1.8 km/hr = –0.5 m/s Vman, B = Vman, A ...

5 years ago
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Answer to: In a reactor, 2 kg of 92U^235 fuel is fully used up in 30 days. The energy released per fission is 200 Mev.

Correct answer: (2) 60 MW Explanation: P = E/t = 2/235 x 6.023 x 1026 x 200 x 1.6 x 10–19/ 30 x 24 x 60 x 60 = 60 W

5 years ago
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Answer to: If speed V, area A and force F are chosen as fundamental units, then the dimension of Young's modulus will be :

Correct answer: (4) FA-1V0 Explanation: Y ∝ FaVbAc Y = (F/A) MLT-2/L2 ∝ (M1L1T-2)a(L1T-1)b(L2)c M1L-1T-2 ∝ MaLa+b+2cT-2a-b a + b + 2c = –1...

5 years ago
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Answer to: A beam of protons with speed 4 × 10^5 ms^–1 enters a uniform magnetic field of 0.3T

Correct answer: (3) 4 cm Explanation: Pitch = (Vcosθ)T = (Vcosθ)2πm/eB = (4 x 105 cos60°) 2π/0.3 x 10(1.67 x 10-27/1.69 x 1019) = 4 cm

5 years ago
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Answer to: An amplitude modulated waves is represented by expression vm = 5 (1 + 0.6 cos 6280t) sin(211 × 10^4 t) volts.

Correct answer: (2) 5/2V, 8V Explanation: From Given Equation μ = 0.6 Am = μAc Amax + Amin/2 = Ac = 5 .....(1) Amax - Amin/2 = 3 .....(2...

5 years ago
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Answer to: Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm).

Correct answer: (3) 1.27 μm Explanation: ΔP = dsinθ = dθ = dy/D = (10-3 x 1.270 mm)/ 1m = 1.27μm

5 years ago
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Answer to: A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T.

Correct answer: (1) 15 Explanation: f1n1RT1/2 + f2n2RT2/2 = 3 x 5/2RT + 5/2 x 3RT = 15

5 years ago
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Answer to: The least count of the main scale of a vernier callipers is 1 mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale.

Correct answer: (2) 3.07 cm Explanation: Zero Error = 0 + 7 × 0.1 = 0.070 Vernier reading = (3.1 + 4 × 0.01) – 0.07 = 3.07

5 years ago
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