Physics Ka Sawal. We covered all the Physics Ka Sawal in this post for free so that you can practice well for the exam.
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Physics Ka Sawal Mock Test for Students
The temperature of a refrigerator is kept at 7 °C to keep the food articles kept in it in good condition. What is its coefficient of performance, if the room temperature is 37 °C?
(A) 7.5
(B) 8.3
(C) 9.33
(D) 10.5
Option c – 9.33
A household refrigerator has a coefficient of performance of 6. If the room temperature outside the refrigerator is 30 °C, what is the lowest temperature that can be obtained inside the refrigerator?
(A) 0 °C
(B) 0 K
(C) – 13 °C
(D) -30 °C
Option c – – 13 °C
The coefficient of performance of a refrigerator working between -3 °C and 27 °C is :
(A) 3
(B) 4
(C) 6
(D) 9
Option d – 9
A refrigerator whose coefficient of performance is 5 extracts heat from the cooling compartment at the rate of 250 J per cycle. The work required per cycle to operate the refrigerator is :
(A) 50 J
(B) 500 J
(C) 750 J
(D) 1250 J
Option a – 50 J
A refrigerator, with its power ‘ON’, is kept in a closed room with its door open. The temperature of the room will :
(A) Rise
(B) Fall
(C) Remains the same
(D) Rise or fall depending on the area of the room
Option a – Rise
A refrigerator is a :
(A) a Heat engine
(B) An electric motor
(C) a Heat engine working in the backward direction
(D) an Air cooler
Option c – a Heat engine working in the backward direction
In an ideal refrigerator, heat from inside at 280 K is transferred to a room at 300 K. What is the amount of heat (in joule) which will be transferred to the room for each joule of electrical energy consumed in the process?
(A) 12 J
(B) 13 J
(C) 15 J
(D) 18 J
Option c – 15 J
A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then the work done by the motor is :
(A) 500 J
(B) 2100 J
(C) 4200 J
(D) 8400 J
Option b – 2100 J
The coefficient of performance of a refrigerator working between 10 °C and 20 °C is :
(A) 2.83
(B) 5.66
(C) 28.3
(D) 56.6
Option c – 28.3
Refrigerator A works between -10 °C and 27 °C while refrigerator B works between -27 °C and 17 °C both removing heats equal to 2000 J from the freezer. Which of the two is the better refrigerator?
(A) A
(B) B
(C) both A and B
(D) cannot be predicted
Option a – A
The efficiency of a heat engine is 50% and the temperature of the sink is 500 K. If the temperature of the source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink should be :
(A) 300 K
(B) 400 K
(C) 500 K
(D) 600 K
Option b – 400 K
An engine has an efficiency of 1/6. When the temperature of the sink is reduced by 62 °C, its efficiency is doubled. What is the temperature of the source?
(A) 37 °C
(B) 60 °C
(C) 99 °C
(D) 124 °C
Option c – 99 °C
A refrigerator acts as
(A) A heat engine
(B) an Air cooler
(C) A heat pump
(D) an Electric motor
Option a – A heat engine
If the door of a refrigerator is kept open, then which of the following is true?
(A) Room is cooled
(B) Room is heated
(C) Room is either cooled or heated
(D) Room is neither cooled nor heated
Option b – Room is heated
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