# General Science MCQ – 129 (Physics)

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1. A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be?
(A) 4 times
(B) Double
(C) Halved
(D) one-fourth

2. Time taken by an 836W heater to heat one liter of water iron 10o C to 400 C is?
(A) 50s
(B) 100s
(C) 150s
(D) 200s

3. The thermo-emf of a thermocouple varies with the temperature θ of the hot junction as E = a θ2 in volts where the ration a/b is 700o C. if the cold junction is kept at 0o C, then the neutral temperature is?
(A) 700oC
(B) 350oC
(C) 1400oC
(D) No neutral temperature is possible for this thermocouple

4. The electrochemical equivalent of metal is 3.3×10−7 kg per coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds, will be?
(A) 19.8 x 10-7
(B) 9.9 x 10-7
(C) 6.6 x 10-7
(D) 1.1 x 10-7

5. A 220 volt, 1000 watt bulb is connected across a 110-volt mains supply. The power consumed will be?
(A) 1000 watt
(B) 750 watt
(C) 500 watt
(D) 250 watt

6. An electric motor operates at 20 rev/sec. What will be the approximate power delivered by the motor if it supplies a torque of 75 N-m?
(A) 1550 W
(B) 4040 W
(C) 7730 W
(D) 9420 W

7. The negative Zn pole of a Daniel cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalence Cu pole in this times is?
(A) 0.242g
(B) 0.180g
(C) 0.141g
(D) 0.126g

8. 2 liters kept in a kettle are heated by 1 KW power source. Kettle is open and it loses heat at the rate of 160 J/s. The time taken for the temperature of kettle to change from 27o C to 77o C is?
(A) 8 min 20 sec
(B) 6 min 20 sec
(C) 5 min
(D) 7 min

9. An ideal gas enclosed in an insulated vessel is heated through a coil of resistance 100 Ω by passing a current of 1 A for 5 minutes, then change in internal energy of the gas is?
(A) 0 KJ
(B) 30 KJ
(C) 10 KJ
(D) 20 KJ

10. When an ideal gas filled in a closed vessel is heated through 1oC, its pressure increases by 0.4%, the initial temperature of the gas was?
(A) 250 K
(B) 2500 K
(C) 250o K
(D) 25o K

General Science MCQ – 128 (Chemistry)

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