std 7 Science 1st term exam

std 7 Science 1st term exam

Q 1. Fill in the blank                                                                                   ( 1 mark each )
1. Salt is a _______ type of food  preservative.
2. ________ of heat does not require a medium.
3. Distance is  a ________ quantity.
4. If a body is moving with a constant velocity its acceleration is ________
5. The leaves have microscopic opening called_______________

Q 2. Match the following                                                                            ( 1 mark each )
                        A                                                             B

           1. Velocity                                                 a) liter
           2. Area                                                       b) Kilogram
           3. Volume                                                  c) m/s
           4. Mass                                                      d) kg/cu.m
           5. Density                                                  e) sq.m

Q. 3. Find the odd man out -                                                                        ( 1 mark each )
1. banana, apple, guava, almond.
2. storing, freezing, settling, drying.
3. salt, vinegar, citric acid, sodium benzoate

Q 4. Give Scientific reasons                                                                         ( 2 marks each )
1. Butterflies have a bong tube-like proboscis.
2. Food remains safe at 5 degrees Celsius.
3. It is necessary to get the wights and measures standardized at regular intervals.
4. Dewdrops form on the grass, in winter.

Q 5. Distinguish between                                                                            ( 2 marks each )
1.  speed and velocity
2.  mass and weight

Q 6. Answer the following questions :                                                        ( 2  marks each )
1. Explain the process of production of food in plants?
2. How does food spoilage occur? Which are the various factors spoiling the food?
3. What precautions will you take to make accurate measurements in day-to-day affairs?
4. Solve: A force of 1000  N  was applied to stop a car that was moving with a constant velocity. The car stopped after moving through 10 m How much is the work done?
5. What are the modes of heat transport?
6. Define displacement, distance.

Q 7. Write a short note on                                                                         ( 2  mark each )
1. Remedial measures for the cloudburst.
2. Pasteurization

Q 8. Answer briefly                                                                                    ( 5 marks each )
1. Write destructive effects of tsunami?
2. What precautions will you take during thunderstorms?

Q 9. Draw a neat labeled diagram of a ' Thermos flask '                       ( 5 mark each )

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