Question 1. If the temperature of air increases, how would it affect its ability to assume water vapour?
(A) Remains constant
(B) Firstly decrease, then again increase
Question 2. In the night wind blows fast, dew is not formed because?
(A) Sky is not clear
(B) Temperature is high
(C) Moisture in air is low
(D) Rate of evaporation is fast
Question 3. Which of the following statements is not true?
(A) Both control motion of air
(B) Air-conditioner maintains humidity but Air-cooler does not maintain humidity
(C) Air-conditioner and Air-cooler both maintain humidity
(D) Air-conditioner and Air-cooler both maintain temperature
Question 4. What does an air conditioner installed in a room control?
(A) Humidity, pressure and temperature
(B) Pressure and temperature only
(C) Humidity and temperature only
(D) Temperature only
Question 5. The cooling by a desert cooler is based on?
(A) Air rehydration
(B) Evaporative cooling
(C) Air dehydration
(D) Hot air replacement
Question 6. Cooling is done by ________.
(A) Melting the solid
(B) Cooking gas
(C) Release of compressed gas
(D) Flow of water
Question 7. In which of the following conditions wet clothes will dry earliest?
(A) 20% RH, 60ºC temperature
(B) 20% RH, 20ºC temperature
(C) 100% RH, 20ºC temperature
(D) 100% RH, 60ºC temperature
Question 8. Which one of the following changes occurs when salt is added into the water?
(A) Both boiling point and freezing point are increased
(B) Both boiling point and freezing point are decreased
(C) Boiling point is decreased and freezing point is increased
(D) Boiling point is increased and freezing point is decreased
Question 9. On adding common salt to water, the boiling point and freezing point of water will?
(A) Increase and decrease respectively
(B) Decrease and increase respectively
Question 10. To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with ________.
(A) Mercury Layer
(B) Silver Layer
(C) Lead Powder
(D) Aluminium Paint
Question 11. It is more comfortable to wear white cloth in summer because_______.
(A) They are soothing to the eye
(B) They absorb perspiration
(C) They radiate heat transferred from the body
(D) They reflect all the heat falling on them
Question 12. When a bottle is filled with water and it is freezing the bottle breaks down, because______.
(A) Water expands on heating
(B) The temperature outside the bottle is higher than inside
(C) Bottle shrinks at freezing point
(D) Water expands upon freezing
Question 13. What changes will the volume of water show if the temperature is lowered from 9ºC to 3ºC?
(A) Water will freeze
(B) The volume will first decrease and then increase
(C) The volume will first increase and then decrease
(D) The volume will not change
Question 14. When water is heated from 0ºC to 10ºC. It’s volume______.
(A) First decreases and then increases
(B) Does not change
Question 15. Maximum temperature inside pressure cooker depends on?
(A) Area of hole on the top only
(B) Weight kept on hole at top and food being cooked
(C) Area of hole on the top and food being cooked
(D) Area of hole on the top and weight kept on it
Question 16. Pressure cooker cooks food in lesser time because ________.
(A) Evaporation of the water used is very small
(B) Temperature of boiling water increases due to high pressure
(C) Air has no effect as it is closed from all sides
(D) The temperature of boiling water decreases due to high pressure
Question 17. Food gets cooked faster in a pressure cooker because ________.
(A) Convection currents are set inside the cooker
(B) Water boils only at 100ºC but the heat content is higher at high pressure
(C) Water starts boiling at a higher temperature due to high pressure
(D) Water starts boiling at a lower temperature due to high pressure
Question 18. The atmosphere exerts enormous pressure on us. But, we do not feel it because ________.
(A) The surface area of our head is very small
(B) Our bones are very strong and can withstand the pressure
(C) Our blood exerts a pressure slightly more than that of the atmosphere
(D) We are used to it
Question 19. Xeric condition refers to _______.
(A) extreme temperature
(B) high evaporation
(C) low humidity
(D) low temperature
Question 20. In the season of summer, we experience a humid heat when weather _____.
(A) Humid weather
(B) Scorching weather
(C) Middle of summer
(D) Start of summer
Question 21. On a specific day and time, the temperature was 48ºC in Churu and 24ºC in Shimla. Two metallic cups identical in all respects contained water at 95ºC in Churu and 71ºC in Shimla. Which one of these two cups reached room temperature first?
(A) Data are not enough to find out result
(B) Both cups reached room temperature at the same time
(C) Cup in Shimla
(D) Cup in Churu
Question 22. In an Earthen pitcher, the water remains cold due to the process of ______.
(D) None of the above
Question 23. A fan produces feeling of comfort during hot weather, because _______.
(A) conductivity of air increase
(B) one body radiates more heat
(C) our perspiration evaporates rapidly
(D) fan supplies cold air
Question 24. Lightning can even burn a tree because it contains tremendous amount of ______.
(A) Nuclear energy
(B) Chemical energy
(C) Electric energy
(D) Heat energy
Question 25. The most important function of perspiration is to ________.
(A) Keep the skin pores clear of dirt
(B) Get rid of body poison
(C) Regulate body water supply
(D) Regulate body temperature