Distance between two successive compressions in a wave in 2cm. If velocity of wave is 250m/s, find its frequency.
Author of "A diary of a young girl"
Ankit1234
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December 2022
Describe the essential features of the model of an atom proposed by Rutherford. How is it different from that proposed by J. J. Thomson?
Ankit1234
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December 2022
Organic farming does not include which of the following - a. Crop rotation b. green manure c. chemical fertilizers d. farmyard manures.
Ankit1234
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December 2022
Pressure exerted by a thrust of 1N on a surface of area 1 cm3will be equal to:- a. 1 Pa b. 100 Pa c. 104 Pa d. 106 Pa
Ankit1234
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December 2022
On heating copper sulphate crystals in a hard test tube it is observed that : (a) The substance sublimes. (b) Brown fumes are evolved. (b) A grey mass is formed. (d) A white residue is left.
Ankit1234
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December 2022
Which of the following is not an exotic breed of cow - a. Jersey b. Sahiwal c. Brown Swiss d. Holstein
Ankit1234
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December 2022
(i) Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic? (ii) Explain the role of the Sun in the formation of soil.
Ankit1234
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December 2022
Give the names of elements present in:- a. Potassium sulphate b. Hydrogen bromide c. Quick lime d. Baking powder
Ankit1234
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December 2022
To solve the food problem of the country, which of the following is necessary? a. Increased production and storage of food grains. b. Easy access of the people to the food grain. c. People should have the money to purchase the grains. d. All of the above.
Ankit1234
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December 2022
The places for keeping and studying dry plants is known as - a. herbarium b. museum c. asylum d. folium
Ankit1234
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December 2022
Which of the following shows Tyndall effect :- starch solution, copper sulphate, milk.
A). A 200 cm3 block has a mass of 495 g. Find its relative density. (Density of water = 1g/cm3 ) B.) Big trucks and tractors have broad tyres. Why?
Ankit1234
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December 2022
(i) If any explosion takes place at the bottom of a lake, what type of shock waves will take place in water?
Ankit1234
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December 2022
Find out the correct statement about the manure. a. Manure contains large quantities of organic matter and quantities of nutrients. b. It helps out in graining out of excess of water from clayey soil. c. It increases the water holding capacity of soil. d. Its excessive use pollutes environment because...
Distinguish between Mass and Weight.