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WBJEE Question Paper 2016

Two coils of self inductances 6mH and 8mH are connected in series and are adjusted for highest co-efficient of coupling. Equivalent self inductance L for the assembly is approximately
(A) 50 mH (B) 36 mH (C) 28 mH (D) 18 mH
Ans : (C)

An 1 uF capacitor C is connected to a battery of 10 V through a resistance 1 M Ω. The voltage across C after 1 sec is approximately
(A) 5.6 V (B) 7.8 V (C) 6.3 V (D) 10 V
Ans : (C)

Two equal resistances, 400 Ω each, are connected in series with a 8 V battery. If the resistance of first one increases by 0.5%, the change required in the resistance of the second one in order to keep the potential difference across it unaltered is to
(A) increase it by 1 Ω (B) increase it by 2 Ω
(C) increase it by 4 Ω (D) decrease it by 4 Ω
Ans : (B)

Angle between an equipotential surface and electric lines of force is
(A) 0° (B) 90° (C) 180° (D) 270°
Ans : (B)

The potential difference V required for accelerating an electron to have the de Broglie wavelength of 1Å is
(A) 100 V (B) 125 V (C) 150 V (D) 200 V
Ans : (C)

The work function of Cesium is 2.27 eV. The cut-off voltage which stops the emission of electrons from a cesium cathode irradiated with light of 600 nm wavelength is
(A) 0.5 V (B) – 0.2V (C) – 0.5V (D) 0.2 V

The number of De-Broglie wavelengths contained in the second Bohr orbit of Hydrogen atom is
(A) 1 (B) 2 (C) 3 (D) 4
Ans : (B)
The wavelength of second Balmer line in Hydrogen spectrum is 600 nm. The wavelength for its third line in Lyman series is
(A) 800 nm (B) 600 nm (C) 400 nm (D) 200 nm
Ans : (None of the given options correct)

The velocity of sound in air at 20°C and 1 atm pressure is 344.2 m/s. At 40°C and 2 atm pressure the velocity of sound in air is approximately
(A) 350 m/s (B) 356 m/s (C) 363 m/s (D) 370 m/s
Ans : (B)
If the temperature of the Sun gets doubled, the rate of energy received on the Earth will increase by a factor of
(A) 2 (B) 4 (C) 8 (D) 16
Ans : (D)

WBJEE Question Paper 2016

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