Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.
Q1. If the doors of a refrigerator are left open for a few hours, the room temperature will
(c) remain the same
(d) decrease only in the area in the vicinity of the refrigerator
Q2. Thermostat is a device which
(a) measures heat
(b) measures temperature
(c) automatically regulates the temperature of a system
(d) automatically regulates pressure of a system
Q3. The cooling by a desert cooler is based on
(a) hot air replacement
(b) air dehydration
(c) evaporative cooling
(d) air rehydration
Q4. When water is heated from 0°C to 4°C, its volume
(c) first increases then decreases
(d) remains the same
Q5. Heat detectors in human skin are sensitive to wavelengths
(a) > 780 nm
(b) 600 – 780 nm
(c) 400 – 600 nm
(d) < 400 nm
Q6. Food in the pressure cooker is cooked faster, as
(a) the boiling point increases due to an increase in pressure
(b) the boiling point decreases due to an increase in pressure
(c) more steam is available at 100°C
(d) more pressure is available at 100°C
Q7. When water is heated from 0°C to 10°C, its volume
(c) does not change
(d) first decreases and then increases
Q8. Which zone of a candle flame is the hottest?
(a) Dark innermost zone
(b) Outermost zone
(c) Middle luminous zone
(d) Central zone
Q9. Evening Sun is not as hot as the mid day sun. What is the reason?
(a) In the evening, radiation travel slowly
(b) In the evening, the temperature of the sun decreases
(c) Ozone in atmosphere absorbs more light in the evening
(d) In the evening, radiations travels larger distance through atmosphere
Q10. A fan produces a feeling of comfort during hot weather, because
(a) Our body radiates more heat in air
(b) fan supplies cool air
(c) conductivity of air increases
(d) our perspiration evaporates rapidly
Exp. If the doors of a refrigerator are left open for a few hours, the room temperature will increase as heat is merely recycled from the room into the refrigerator and then back into the room. Thus, a net room temperature would increase from the heat of the motor that would be constantly running to move energy around in a circle.
Exp. Thermostat is a device which automatically regulates the temperature of a system. As the word suggests. Thermostat = Termo + stat i.e., keeping temperature (Thermo) Constant (static)
Exp.Desert coolers are based on the simple principle of hot air replacement where unsaturated air comes in contact with water leading to evaporation of water. In the process, the moisture content of air increases, while its temperature decreases. The resulting cold but moist air is used for providing cooling.
Exp. When water is heated from 0°C to 4°C, its volume decreases. Density =
Density of water is maximum at 4°C.
Exp. Heat detectors in human skin are sensitive to wavelengths < 400 nm.
Exp. The pressure cooker works on the principle of Gay-Lusaac’s Law which states that at constant volume, pressure is directly proportional to temperature. So when we heat the cooker, the inside temperature increases, thereby increasing the pressure and thus, cooking the food faster.
Exp.When water is heated from 0°C to 10°C then the volume of water first decreses and then increases. This is because water contracts on heating from 0°C to 4°C while expands from 4°C onwards.
Exp.There are several zones within a non-luminous flame with each zone having a different temperature. The outer most zone of the flame is blue in colour and it is hottest part. This is due to complete combustion. The middle zone is moderately not and yellow in colour as partial combustion occur in this zone while the innermost zone is the least not and black in colour due to presence of unburned wax vapours.
Exp.In evening, the radiation from the sun travel larger distance through atmosphere that’s why evening sun is not as hot as the mid day sun.
Exp. A fan produces a feeling of comfort during hog weather because our perspiration evaporates rapidly.
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