RRB JE PYQ 2025 CBT 1 PDF : Prepare for the RRB JE examination with previous year questions and question papers from RRB JE 2025 CBT 1. Practicing RRB JE 2025 CBT 1 PYQ PDF questions can help you become familiar with the question format, understand the level of questions, and improve your preparation through regular practice. Exam Date 2026 , 19 Feb, 20 Feb and 25 Feb & All 7 Shift.
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RRB JE 2025 CBT 1 PYQ
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RRB JE CBT 1 Question Paper 2025 PDF
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RRB JE Previous Year Question Paper CBT 1 with Solutions
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RRB JE 2025 Science PYQ
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RRB JE 2025 CBT 1 ALL SHIFT Question PaperRRB JE CBT1 PYQ • Free PDF Download
To convert a temperature on the kelvin scale to Celsius, you:
RRB JE
23/05/2019 (Shift-I)
2019
✓ Answer:AMust subtract 273
Using the school approximation, °C = K - 273. The exact offset is 273.15.
162
Transfer of heat occurs by conduction, convection and radiation mainly in:
RRB JE
14/12/2014
2014
✓ Answer:CBoiler furnaces
All three modes contribute in boiler furnaces: radiation from hot flames, convection in fluids and conduction through solid walls.
163
How does the thermal conductivity of a solid metal generally change with increasing temperature?
RRB JE
14/12/2014
2014
✓ Answer:BIt decreases
The source selects B. The thermal conductivity of many pure metals decreases as temperature rises, but the actual dependence varies with the metal and temperature range.
164
The amount of radiation mainly depends upon:
RRB JE
14/12/2014
2014
✓ Answer:DAll of the above
Thermal radiation depends on temperature and emissivity; emissivity depends on the material and surface characteristics.
165
What is the main mode of heat transfer in liquids and gases?
RRB JE
14/12/2014
2014
✓ Answer:BConvection
Bulk movement in liquids and gases transports heat by convection.
166
A hot body obeys Newton's law of cooling. Which temperature-versus-time graph represents its cooling? (Graph options are described in words.)
RRB JE
14/12/2014
2014
✓ Answer:DTemperature decreases rapidly at first and then gradually levels off; a concave-up curve
For constant surroundings, T - Ts = (T0 - Ts)e^(-kt). The cooling rate decreases as the temperature approaches the surroundings, giving the curve described in D.
167
Running a fan gives relief in summer because:
RRB JE
14/12/2014
2014
✓ Answer:AOur sweat evaporates rapidly in the air from the fan
Moving air accelerates sweat evaporation and can also increase convective heat loss when air is cooler than skin. The source selects A.
168
The expected qualities of a refrigerant are:
RRB JE
14/12/2014
2014
✓ Answer:DAll of the above
A suitable refrigerant should evaporate at a low working temperature, absorb substantial heat during evaporation and permit practical condensation conditions.
169
In thermodynamics, the zeroth law states that:
RRB JE
14/12/2014
2014
✓ Answer:DIf two systems are each in thermal equilibrium with a third system, they are also in equilibrium with each other
The zeroth law establishes the transitive nature of thermal equilibrium and provides the basis for temperature measurement.
170
The entropy of the universe tends towards:
RRB JE
14/12/2014
2014
✓ Answer:DA maximum
The second law states that total entropy does not decrease in an isolated system; spontaneous irreversible processes increase it toward equilibrium.
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