class 7th test

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class 7th test

time : 45min

Name of student

1.A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile

1 point

(a) is a better conductor of heat than the wooden tile.

(b) is polished while wooden tile is not polished.

(d) is a poor conductor of heat than the wooden tile.

Clear selection

2.Paheli and Boojho measured their body temperature. Paheli found her’s to be 98.6 °F and Boojho recorded 37°C. Which ofthe followng statement is true?

1 point

(a) Paheli has a higher body temperature than Boojho.

(b) Paheli has a lower body temperature than Boojho.

(d) Both are suffering from fever.

Clear selection

3.A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because

1 point

(a) friction between the layers of newspaper produces heat.

(b) air trapped between the layers of newspaper is a bad conductor of heat.

(d) newspaper is at a higher temperature than the temperature of the surrounding

Clear selection

4.225% is equal to (a) 9 : 4 (b) 4 : 9 (c) 3 : 2 (d) 2 : 3

1 point

Clear selection

5.If 90% of x is 315 km, then the valueof x i s(a) 325 km (b) 350 km(c) 405 km (d) 340 km

1 point

Clear selection

6) Differentiate between two modes of transfer of heat, i.e. convection and conduction

3 points

7. While reading a clinical thermometer, what precautions should we take?

3 points

8.State the limitation of clinical thermometer.

3 points

9.In a class of 50 students, 20 % were absent on one day. The number of students present on that day was ________.

3 points

10.Amount obtained by depositing ` 20,000 at 4 % per annum for six months is ________.

3 points

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