SSC CGL Science – Heat & Thermodynamics – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Science – Heat & Thermodynamics – Level 2 · Exam Level · Tier I Sprint – 15 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Taking K = C + 273, at what Celsius temperature is the kelvin reading 2.5 times the Celsius reading?

Correct Answer: B [182 °C]

Explanation:

C + 273 = 2.5C → 1.5C = 273 → C = 182 °C (K = 455).

2.  
A temperature of 77 °F is equal to:

Correct Answer: A [25 °C]

Explanation:

Answer: 25 °C. (77 − 32) × 5/9 = 25.

3.  
A temperature of 300 K is about:

Correct Answer: D [27 °C]

Explanation:

Answer: 27 °C. 300 − 273 = 27 °C.

4.  
The heat needed to raise the temperature of 5 kg of water by 10 °C is (c = 4200 J/kg °C):

Correct Answer: C [2.1 × 10⁵ J]

Explanation:

Q = 5 × 4200 × 10 = 2,10,000 J.

5.  
1 kg of water at 60 °C is mixed with 3 kg of water at 20 °C. The final temperature (no loss) is:

Correct Answer: C [30 °C]

Explanation:

Answer: 30 °C. (60 + 60)/4 = 30 °C.

6.  
Match the followingMatch the column:
P. Sea breeze Q. Warmth from a fire R. Hot handle of a metal pan S. Thermos flask
1. Radiation 2. Conduction 3. Convection 4. Reduces all three modes

Correct Answer: A [P-3, Q-1, R-2, S-4]

Explanation:

Breeze – convection; fire – radiation; handle – conduction; thermos flask – vacuum + silvering.

7.  
Assertion–ReasonAssertion (A): Coastal areas have a moderate climate.
Reason (R): Water has a high specific heat, so the sea warms and cools slowly.

Correct Answer: D [Both A and R are true and R explains A]

Explanation:

The sea acts as a heat reservoir.

8.  
Two-quantity comparison
Quantity I: a temperature difference of 10 °C
Quantity II: a temperature difference of 10 K

Correct Answer: C [Quantity I = Quantity II]

Explanation:

A degree Celsius and a kelvin are the same size; only the zero differs.

9.  
Arrange in orderArrange in increasing order of specific heat: water, copper, aluminium, iron

Correct Answer: B [copper < iron < aluminium < water]

Explanation:

Copper 386 < iron 450 < aluminium 900 < water 4186 J/kg K.

10.  
True/false countHow many of these increase the rate of evaporation?
I. Higher temperature
II. Larger surface area
III. Higher humidity
IV. Wind

Correct Answer: C [3]

Explanation:

Humidity slows evaporation; the other three speed it up.

11.  
Ice is sprinkled with salt to make a freezing mixture because salt:

Correct Answer: B [lowers the melting point of ice]

Explanation:

The ice–salt mixture can go well below 0 °C.

12.  
On a high mountain, rice takes longer to cook because:

Correct Answer: A [water boils below 100 °C at low pressure]

Explanation:

Lower pressure → lower boiling point → food is cooked at a lower temperature.

13.  
Diagram-basedThe graph shows a substance heated steadily from a solid. In which part is the latent heat of vaporisation absorbed?

Correct Answer: D [S]

Explanation:

Flat part at the higher temperature (100 °C) = boiling; Q is melting.

14.  
An open refrigerator is run in a closed, insulated room for some hours. The room will:

Correct Answer: B [become warmer]

Explanation:

The heat pumped out comes back into the room, plus the electrical work.

15.  
Black-coloured cooking pots are used because black surfaces are good:

Correct Answer: A [absorbers of radiation]

Explanation:

A dull black surface absorbs most of the radiation falling on it.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science

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