Answer the following questions: A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter tothe diver than what he actually is?

Answer the following question: If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

In these question, a statement of assertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion: The sun looks bigger in size at sunrise and sunset than during day. Reason: The phenomenon of diffraction bends light rays.

Rohit went to Jaipur with a school trip to visit some historical places. He and his friends observed that some old glass objects looked milky and windows pane of old buildings were looking slightly thicker at the bottom than at the top. Answer the following questions Under what conditions could quartz be converted into glass?

Rohit went to Jaipur with a school trip to visit some historical places. He and his friends observed that some old glass objects looked milky and windows pane of old buildings were looking slightly thicker at the bottom than at the top. Answer the following questions Is glass crystalline or amorphous?

In an experiment to estimate the size of a molecule of oleic acid 1mL of oleic acid is dissolved in 19 mL of alcohol. Then 1 mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow trough. The solution spreads over the surface of water forming one molecule thick layer. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule. Read the passage carefully and answer the following questions : What would be the volume of oleic acid in each mL of solution prepared?

Rekhe observed that her mother placed shrinkled or dried vegetables in water before cutting these for cooking. After sometime, these vegetables looked fresh. Answer the following questions: What is the name of the process used and define it.

Rekhe observed that her mother placed shrinkled or dried vegetables in water before cutting these for cooking. After sometime, these vegetables looked fresh. Answer the following questions: Why did Rekha's mother place the shrinkled or dried vegetables in water?

Observe the histogram (fig.) and answer the question given below: (i) What information is being given by the histogram? (ii) Which group contains maximum girls. (iii) How many girls have height 145 cms. and more? (iv) If we divide the girls into the following three categories, how many would there be in each? 150 cm and more - Group A 140 cm to less than 150 cm - Group B Less than 140 cm - Group C