Starting from A, Diksha moves along a rectangular path ABCD as shown in figure. She takes 2 min to travel each side. (3+2=5)
a) Plot a distance-time graph and explain whether the motion is uniform or non-uniform.
b) Find her average speed to cover one complete round of the field.
26.a) How is oxygen transported from lungs to other parts of the body? (3+2=5)
b) Why do we need to breathe out carbon dioxide?
OR
a) A spaceship travels 36000 km in one hour. Express its speed in km/s.
b) Distinguish between uniform and non-uniform motion. Give one example for each.
27.a) Why does mercury not rise or fall in a clinical thermometer when taken out of the mouth?
b) What are conductors and insulators? Give examples. (1+2+2 =5)
c) A circular metal loop is heated at point O as shown in figure.
(i) In which direction, would heat flow in the loop?
(ii) In which order, the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
28.a) Given below is a figure of the distance-time graph of the motion of an object. (i) What will be the position of the object at 20 s? (3+2 =5)
(ii) What will be the distance travelled by the object in 12 s?
(iii) What is the average speed of the object?
b) The Shatabdi Express takes 6 hours to travel from New Delhi to Lucknow at an average speed of 80 km/hr. Find the distance from New Delhi to Lucknow.
OR
a) Draw a neat, well labelled diagram of the human digestive system.
b) How is digested food absorbed into the blood?
29. a) How is a chemical change different from a physical change? (2+3=5)
b) Classify the following reactions into different types and give reason for your answer.
(i) H2CO3 H2O + CO2
(ii) NaOH + H2SO4 Na2SO4 + H2O
(iii) Fe + CuSO4 FeSO4 + Cu
30. a) Justify the statement ‘All alkalies are bases but all bases are not alkalies’. (2+3=5)
b) Write chemical equations for the following reactions and balance it :
(i) Nitric acid with Calcium hydroxide
(ii) Sodium hydroxide with Hydrochloric acid
(iii) Magnesium hydroxide with Sulphuric acid
OR
a) Why do we get muscle cramps after heavy exercise ?
b) Differentiate between Aerobic respiration and Anaerobic respiration. Give one example for each.
c) In plants respiration takes place with the help of two parts. Name them.
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Starting from A, Diksha moves along a rectangular path ABCD as shown in figure. She takes 2 min to travel each side. (3+2=5)
a) Plot a distance-time graph and explain whether the motion is uniform or non-uniform.
b) Find her average speed to cover one complete round of the field.
26.a) How is oxygen transported from lungs to other parts of the body? (3+2=5)
b) Why do we need to breathe out carbon dioxide?
OR
a) A spaceship travels 36000 km in one hour. Express its speed in km/s.
b) Distinguish between uniform and non-uniform motion. Give one example for each.
27.a) Why does mercury not rise or fall in a clinical thermometer when taken out of the mouth?
b) What are conductors and insulators? Give examples. (1+2+2 =5)
c) A circular metal loop is heated at point O as shown in figure.
(i) In which direction, would heat flow in the loop?
(ii) In which order, the pins at points P, Q and R fixed with the help of wax fall if points O, P, Q and R are equidistant from each other?
28.a) Given below is a figure of the distance-time graph of the motion of an object. (i) What will be the position of the object at 20 s? (3+2 =5)
(ii) What will be the distance travelled by the object in 12 s?
(iii) What is the average speed of the object?
b) The Shatabdi Express takes 6 hours to travel from New Delhi to Lucknow at an average speed of 80 km/hr. Find the distance from New Delhi to Lucknow.
OR
a) Draw a neat, well labelled diagram of the human digestive system.
b) How is digested food absorbed into the blood?
29. a) How is a chemical change different from a physical change? (2+3=5)
b) Classify the following reactions into different types and give reason for your answer.
(i) H2CO3 H2O + CO2
(ii) NaOH + H2SO4 Na2SO4 + H2O
(iii) Fe + CuSO4 FeSO4 + Cu
30. a) Justify the statement ‘All alkalies are bases but all bases are not alkalies’. (2+3=5)
b) Write chemical equations for the following reactions and balance it :
(i) Nitric acid with Calcium hydroxide
(ii) Sodium hydroxide with Hydrochloric acid
(iii) Magnesium hydroxide with Sulphuric acid
OR
a) Why do we get muscle cramps after heavy exercise ?
b) Differentiate between Aerobic respiration and Anaerobic respiration. Give one example for each.
c) In plants respiration takes place with the help of two parts. Name them.
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1
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