Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is + 4Q. We move the +Q and +4Q charges to be 3 times as far apart as they were. What is the magnitude of the force on the +4Q charge ?

1) F
2) 4F
3) 4F/3
4) 4F/9

IIn a series L−C−R circuit, current in the circuit is 11A when the applied voltage is 220V. Voltage across the capacitor is 200V. If value of resistor 20Ω, then the voltage across the unknown inductor is

1) Zero
2) 200V
3) 20V
4) None of these

At what height from the surface of earth thegravitation potential and the value of g are –5.4 × 10⁷ J kg^–2 and 6.0 ms^–2 respectively ?Take the radius of earth as 6400 km :

1) 2600 km
2) 1600 km
3) 1400 km
4) 2000 km

2 kg of a substance of specific heat capacity c, and a piece of aluminum of mass 2m and specific heat capacity 2c each received the same quantity of heat. The temperature of the aluminum rose by 8 K. By how much did the temperature of the iron rise?
 
 (1) 2 K
 (2) 4 K
 (3) 8 K
 (4) 16 K

 Ratio of voltages in a step up transformer is 8. If voltage at primary is 120 volt then the voltage at the secondary will be:

(1) 960 Volt             (2) 180 Volt

(3) 120 Volt             (4) 150 Volt

A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?

1) 49 N
2) 20. N
3) 5.0 N
4) 4.0 N

One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings (ΔS_surr) in JK^-1 is (1 L atm = 101.3 J)

1) 5.763
2) 1.013
3) -1.013
4) -5.763

A vessel of volume 0.2m³ contains hydrogen gas at temperature 300K and pressure 1bar1bar. Find the heat (in kcal) required to raise the temperature to 400K. The molar heat capacity of hydrogen at constant volume is (5 cal/molK)

1) 4
2) 2
3) 1
4) 8

 In the definition of 'calorie', the heat required to raise the temperature of 1 gram of water through 1°C in the range of temperature and pressure.

(1) 3.5 to 4.5°C, 76mm of Hg
(2) 13.5 to 14.5°C 76mm of Hg
(3) 14.5 to 15.5°C 760mm of Hg
(4) 98.5 to 99.5°C 760mm of Hg

An object is projected up wards with velocity of 100 m/sec. it will strike the ground in approximately ( g=10 m/sec2)
1) 10 sec
2) 5 sec
3) 15 sec
4) 20 sec