#### Term 1 Model Questions

7th Standard EM

Reg.No. :
•
•
•
•
•
•

Science

Time : 02:00:00 Hrs
Total Marks : 60
5 x 1 = 5
1. From the given v-t graph it can be inferred that the object is

(a)

in uniform motion

(b)

at rest

(c)

in non uniform motion

(d)

moving with uniform acceleration

2. Which of the following is a short and scientific way of representing one molecule of an element or compound?

(a)

Mathematical formula

(b)

Chemical formula

(c)

Mathematical symbol

(d)

Chemical symbol

3. Pollinators are

(a)

Wind

(b)

Waer

(c)

Insect

(d)

All the above

4. Sleep is not only good for body, but it is also good for

(a)

Enjoyment

(b)

Relaxation

(c)

Mind

(d)

Environment

5. Which software is used to create symbols

(a)

Photoshop

(b)

Illustrator

(c)

Vector Graphics

(d)

Photostory

6. 5 x 1 = 5
7. Density of mercury is _______

()

13,600 kg/m3

8. The rate of change of velocity is _______

()

acceleration

9. ________is the only non-metal conducts electricity.

()

Graphite

10. __________is the basal swollen part of the Gynoecium.

()

Ovary

11. The hair follicles produce _____ which keeps the hair smooth.

()

oil

12. 5 x 1 = 5
13. A ball of iron floats in mercury.

(a) True
(b) False
14. Non-metals are usually, good conductors of heat and electricity.

(a) True
(b) False
15. Most of the space in an atom is occupied by electrons

(a) True
(b) False
16. Mass number determines the number of atoms of an element that combines with atom or atoms of another type.

(a) True
(b) False
17. Leaves of Aloe vera are fleshy and store water.

(a) True
(b) False
18. 5 x 1 = 5
19. Area

20. (1)

Mycobacterium

21. Speed of ship

22. (2)

Microsoft Photostory

24. (3)

Opuntia

25. Tuberculosis

26. (4)

plane figures

27. Video Story

28. (5)

Knot

3 x 2 = 6
29. Assertion (A): The distance between two celestial bodies is measured by the unit of light year
Reason (B): The distance travelled by the light in one year in vacuum is called one light year
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true.

30. Assertion (A): Volume is a derived quantity.
Reason (B): The amount of space occupied by a three dimensional object is known as its volume
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true

31. Assertion (A): We must offer first aid to a bleeding person.
Reason (R): We must not use gloves while helping them.
(a) Both A and R are true
(b) Both A and R are false
(c) A is true but R is false
(d) A is false but R is true

32. 3 x 1 = 3
33. Complete the following table by writing compound of its constituent:

 Compound Constituent elements Sodium carbonate Sodium, Carbon, Oxygen Water (i) ? Calcium oxide (ii) ? Sugar Carbon, Hydrogen, Oxygen
34.  Element Latin Name Symbol Mercury - Hg Lead Plumbum - Iron - Fe Potassium Kalium -
35.  Underground stem __ (1)__ Ginger __ (2)__ Runner __ (3)__ Leaf modification __ (4)__ Acacia Root modification sucking Roots __ (5)__
36. 6 x 2 = 12
37. Give the formula to find the density of objects.

38. Find the area of the following regular shaped figures: (Take $\pi$ = 22/7)
(a) A rectangle whose length is 12 m and breadth is 4 m.
(b) A circle whose radius is 7 m.
(c) A triangle whose base is 6 m and height is 8 m.

39. Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon-di-oxide
d. Calcium oxide
e. Sulphur dioxide

40. What is atomic number?

41. Define – pollination.

42. What is hygiene?

43. 3 x 3 = 9
44. A solid cylinder of mass 280 kg has a volume of 4 m3. Find the density of cylinder.

45. Differentiate mass number from atomic number.

46. Name the mode of transmission of communicable disease.

47. 2 x 5 = 10
48. Draw the atom structure and explain the position of the sub-atomic particles.

49. Write about any three Communicable diseases in details.