Goyal Brothers Prakashan Physics Class 10 Solutions. We covered all the Goyal Brothers Prakashan Physics Class 10 Solutions in this post for free so that you can practice well for the exam.
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Physics Class 10 Trivia for Students
Two heat engines A and B have their sources at 327 °C and 227 °C and sinks at 127 °C and 27 °C respectively. The ratio of their efficiencies is :
(A) 1 : 3
(B) 2 : 5
(C) 5 : 6
(D) 3 : 5
Option c – 5 : 6
An heat engine absorbs Q of heat from a reservoir at an absolute temperature T and rejects heat to a sink at a temperature of T/3. The amount of heat rejected is :
(A) Q/4
(B) Q/3
(C) Q/2
(D) 2Q/3
Option b – Q/3
A heat engine working between 300 K and 600 K has work output of 820 J per cycle. What is amount of heat energy supplied to the engine from source per cycle ?
(A) 1000 J/cycle
(B) 1600 J/cycle
(C) 1800 J/cycle
(D) 2000 J/cycle
Option b – 1600 J/cycle
In an ideal refrigerator, heat from inside at 277 K is transferred to a room at 300 K. How much joules of heat will be delivered to the room from each joule of electrical energy consumed?
(A) 1 J
(B) 12 J
(C) 13 J
(D) 25 J
Option c – 13 J
An ideal refrigerator is used to transfer heat from a freezer at -23 °C to the surroundings at 27 °C. Its coefficient of performance is :
(A) 2.5
(B) 5
(C) 7.5
(D) 10
Option b – 5
Equal volumes of two liquids are cooled under identical circumstance from 60 °C to 50 °C and times taken by then are 324 and 810 seconds respectively. If ratio of their specific heat is 3 : 4 then the ratio of their densities will be (W may be neglected) :
(A) 0.53 : 1
(B) 0.53 : 2
(C) 0.53 : 3
(D) 0.53 : 4
Option a – 0.53 : 1
A solid copper sphere of radius R and a hollow copper sphere of equal internal and external radius R are heated to same temperature and are then allowed to cool in same atmosphere. Which of the following statements is correct?
(A) Both the spheres will cool simultaneously
(B) The temperatures of two spheres will be same
(C) The rate of cooling of solid sphere will be more than that of hollow sphere
(D) The rate of fall of temperature of hollow sphere will be more than that of solid sphere
Option d – The rate of fall of temperature of hollow sphere will be more than that of solid sphere
Initial temperatures of metallic sphere and disc, of same radius and same nature, are same. The ratio of their rates of cooling will be :
(A) 1 : 4
(B) 4 : 1
(C) 1 : 2
(D) 2 : 1
Option d – 2 : 1
In the expression for Boyle’s law, the product ‘PV’ has dimensions of :
(A) force
(B) impulse
(C) energy
(D) momentum
Option c – energy
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