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 700^o C. if the cold junction is kept at 0^o C, then the neutral temperature is?
(A) 700^oC
(B) 350^oC
(C) 1400^oC
(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 27^o C to 77^o 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) 250^o K
(D) 25^o K

General Science MCQ – 128 (Chemistry)