SSC CGL Science – Heat & Thermodynamics – Level 1 · Warm-up · Tier I Level

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SSC CGL Science – Heat & Thermodynamics – Level 1 · Warm-up · Tier I Level – 12 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.  
One-line factThe SI unit of temperature is:

Correct Answer: C [kelvin]

Explanation:

Kelvin is one of the seven SI base units.

2.  
A winter night in Shimla at −10 °C reads on the Fahrenheit scale:

Correct Answer: A [14 °F]

Explanation:

9 × (−10)/5 + 32 = −18 + 32 = 14 °F.

3.  
Water has its maximum density at:

Correct Answer: D [4 °C]

Explanation:

Answer: 4 °C. Anomalous expansion of water.

4.  
Fill in the blankHeat from the Sun reaches the Earth by ____.

Correct Answer: B [radiation]

Explanation:

Space is (nearly) empty; only radiation needs no medium.

5.  
A burn caused by steam at 100 °C is more severe than one by boiling water at 100 °C because steam has:

Correct Answer: D [extra latent heat]

Explanation:

Each kg of condensing steam gives out about 2.26 × 10⁶ J more.

6.  
In a pressure cooker, food cooks faster because:

Correct Answer: C [the boiling point of water rises]

Explanation:

Higher pressure → water boils at about 120 °C.

7.  
Odd one outOdd one out (by the process):

Correct Answer: B [boiling of water]

Explanation:

The other three are sublimation (solid → gas directly).

8.  
Water in an earthen pot (matka) stays cool in summer because of:

Correct Answer: A [evaporation]

Explanation:

Water seeping through the pores evaporates and takes latent heat from the pot.

9.  
Statement-basedConsider the statements:
I. Woollen clothes keep us warm because they trap air, a poor conductor.
II. Woollen clothes produce heat.
Which is/are correct?

Correct Answer: B [Only I]

Explanation:

Wool produces no heat; trapped air reduces heat loss.

10.  
Gaps are left between railway rails to allow for:

Correct Answer: C [thermal expansion]

Explanation:

Rails expand in summer; without gaps they would buckle.

11.  
A thermostat in an electric iron uses a:

Correct Answer: D [bimetallic strip]

Explanation:

Two metals with different expansion – the strip bends and breaks the circuit.

12.  
The range of a clinical thermometer is usually:

Correct Answer: A [35 °C to 42 °C]

Explanation:

It needs only the range of human body temperature.

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