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Science [2 Mark Questions]

Thermal Physics · Tamil Nadu Board STD 10 (Tamil - English Medium). 7 questions.

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[2 Mark Questions]

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7 questions · timed · auto-graded

Question 12 Marks
In the upper atmosphere, the kinetic temperature of the air is of the order of 1000 K even then one feels severe cold in these places. Why?
Answer
As we go at higher altitude the density of air decreases. So distances between molecules increases due to less number of collisions between them. Due to above reason speed of air molecules, the kinetic temperature is of order 1000 K but due to higher altitude, the temperature decreases as the radiation from earth takes longer distance.
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Question 22 Marks
What are the characteristic feature of transfer of heat energy?
Answer
  1. Heat always flows from a system at higher temperature to a system at lower temperature.
  2. The mass of a system is not altered when it is heated or cooled.
  3. For any exchange of heat, the heat gained by the cold system is equal to heat lost by the hot system. Heat gained = Heat lost
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Question 32 Marks
Why do the ventilators provide near the ceiling of the classroom?
Answer
The density of hot air is smaller than cold air, so it rises up near the ceiling where it passes out. through ventilators and the cold air from the window, orders fill up the place.
Like this cold and fresh air remain near the floor and hot air passes out from ventilators.

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Question 42 Marks
The surroundings above a fire is hotter than the surroundings below the fire. Why?
Answer
Air surrounding the fire carries heat upwards.
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Question 52 Marks
Can you boil water in a paper cup? Explain.
Answer
Yes, we can boil water in the paper cup due to the following reason.

  • Most type of paper bums at about 230°C.
  • Water can pass at the bottom through pores of the paper.
  • Hot water rises up due to hot conventional current and replaces the cold water.
  • Water boils at 100°C.

The heat of bums warms the water which rises up in a cup, by replacing cold water so heat does not heat up the paper. So water boils in a cup of paper.

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Question 62 Marks
Why does the pendulum clock run slow in summer and fast in winter?
Answer
As we know that time period of pendulum clock $T =2 \pi \sqrt{\frac{ L }{ g }}$ at a place $g$ and $2 \pi$ are constant. so $T \alpha \sqrt{ L }$
The length of pendulum in summer increases so the time period of a pendulum is increased. So pendulum takes more time to complete one oscillation and the clock becomes slow in summer. Vice - versa in winter it becomes fast as a time period of a pendulum is decreased due to a decrease in length of a pendulum.
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Question 72 Marks
The earth without its atmosphere would be inhospitably cold why?
Answer
The earth without its atmosphere would be inhospitably cold.
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[2 Mark Questions] - Science STD 10 Questions - Vidyadip