Sample paper science

Sample Paper
Class 7 Science
Sample Paper 1 | Class 7 Science

Class 7 Science

Sample Paper - 1

MAX. MARKS: 80 DURATION: 2½ HRS

General Instructions:

(i) All questions are compulsory.

(ii) This question paper contains 23 questions divided into four Sections A, B, C and D.

(iii) Section A comprises 3 Questions (Fill in the Blanks, Multiple choice questions and True and False) of 20 marks.

(iv) Section B comprises 8 questions of 2 marks each.

(v) Section C comprises 8 questions of 3 marks each.

(vi) Section D comprises 4 questions of 5 marks each.

SECTION – A

Question 1:

FILL IN THE BLANKS: (1 x 10 = 10)

1. The leaves have a green pigmentation called_________.

2. An object moving along a straight line with a constant speed is said to be in ________.

3. The phenomenon of bouncing back of light falling on a smooth polished surface is known as _________.

4. A change in which one or more new substances are formed is called a _________.

5. Amarbel is an example of a _________ plant.

6. The micro-organisms which convert the dead plants and animals to humus are known as ___________.

7. The vessels which carry carbon dioxide rich blood from all the parts of the body back to the heart are called________.

8. Stainless steel is an alloy of iron with______.

9. __________is the male reproductive part of the flower.

10. The combination of two or more cells is called a ____________.

Question 3:

Choose the correct answer (1 X 5 = 5)

1. If the soil contains greater proportion of bigger particles, it is called

(a) Sandy soil

(b) Clayey soil

(d) Red soil

2. The acid secreted by stomach is

(a) HCl

(b) H₂Cl

(d) K₂Cl

3. Which of the following mirrors is used in automobiles as rear-view mirror?

(a) Concave mirror

(b) Convex mirror

(d) Both a and b

4. Bile plays an important role in the digestion of __________.

(a) proteins

(b) carbohydrates

(d) all of these

5. A chemical change in which an element or compound unites with oxygen is called ____________.

(a) Oxidation

(b) Rusting

(d) Burning

Question 3:

Write ‘True’ or ‘False’: (1 X 5 = 5)

1. The process of breakdown of food in the cell with the release of energy is called aerobic respiration.

2. The cell which results after fusion of the gametes is called a zygote.

3. The device that measures the distance moved by the vehicle. This meter is known as speedometer.

4. Carbon dioxide is released during photosynthesis.

5. The freshwater stored in the ground is much more than that present in the rivers and lakes of the world.

Question 4:

Distinguish between a parasite and a saprotroph.

Question 5:

Name any two effects of electric current.

Question 6:

In places of hot climate, it is advised that the outer walls of houses be painted white. Explain.

Question 7:

Give two uses of convex mirrors.

Question 8:

Why should oils and fats be not released in the drain? Explain.

Question 9:

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

Question 10:

Why do we often sneeze when we inhale a lot of dust-laden air?

Question 11:

Explain why burning of wood and cutting it into small pieces is considered as two different types of changes.

Section – C (3 marks each)

Question 12:

What will happen if there are no platelets in the blood?

Question 13:

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.

Question 14.

Give a brief description of the process of synthesis of food in green plants.

Question 15:

Take three test tubes. Fill each of them with water. Label them with A, B and C. Keep a snail in a test tube A, a water plant in test tube B and in c, keep a snail and plant both, which test-tube would have the highest concentration of CO₂.

Question 16:

The distance between two stations is 240 Km. A train takes 4 hours to cover this distance. Calculate the speed of the train.

Question 17:

Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink; another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

Question 18:

Distinguish between acid and bases.

Question 19.

What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

Section – D (5 marks each)

Question 20:

Explain why there is no waste in a forest.

Question 21:

List the similarities and difference between aerobic and anaerobic respiration.

Question 22:

Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers?

What are the components of blood?