CBSE Class 7 Science Physics Chemistry Biology Worksheet

Define the terms: a) TIME PERIOD

b) OSCILLATION

C) AMPLITUDE

2 What is the time period of a seconds pendulum?

3 A pendulum completes one oscillation in 1.5 second w hat is the time period of the

pendulum?.

4 Name an instrument which is used to produce sound in the laboratory?

5 What are the conditions necessary for hearing sound?

6 We cannot hear on moon, why?

CHEMISTRY

1 Label the marked parts of the diagram given below.

2 By which method is the gas collected in the gas jar?

3 Write the balanced equation for the laboratory preparation of carbon dioxide.

BIOLOGY

1. a.Identify the given algae.

b. What is obtained from this alga?

2. Which fungi is used for the production of citric acid in soft drink industry?

3. What happens during the formation of curd?

Physics

Answer the following

1. A body is moving along a circular track covering one complete round of 60 m

in 10 sec. Find the average speed and average velocity of the body.

2. When a body moves with uniform velocity what will be the acceleration.

3. When can displacement of a body be zero.

4. Can a body execute both rotatory and translatory motion simultaneously?

Give example.

5. Write the S.I unit of velocity.

CHEMISTRY

1. Explain the preparation of oxygen gas in the laboratory with the help of a neat and labelled diagram.

2. What are the conditions required for rusting?

3. Write down the balanced equations for rusting.

BIOLOGY

Answer the following

1. Name the most important cells of phloem?

2. Name the different kinds of connective tissues.

3. Write down the contents of plasma.

4. Write three differences between meristematictissue and permanent tissues.

5. Name the different types of epithelial tissue.

PHYSICS

1 Identify the type of motion in the following:

a The movement of a birds wings

b The motion of a swing.

c The hands of a clock

d The turning of a merrygo round.

e The motion while marching in a parade

2. Write the difference between oscillatory and vibratory motion?

3. What is uniform motion? Explain with an example

CHEMISTRY

1. Write the chemical names of the following compounds:
1) AgNO₃
2) PbO
3) CH₄
4) NaHCO₃
5) MgSO₄

2. Write down the formulae of the following ions or radicals:

1. a) Acetate b) Nitrate c) Peroxide d) Phosphide e) Ammonium

3. Balance the following equations.

HNO3 + Ca(OH)2 → Ca(NO₃)₂  + H₂ O

AgCl → Ag + Cl₂

4. Represent silver and mercury both for lower and higher valencies.

BIOLOGY

I Answer in one word.

a. Name the tissues where Companion cells are found.

b. Name the Parenchyma cells containing chloroplasts.

c. The other name for dermal tissue.

d. The tissue which transports food from leaf to the different parts of the plant.

e. Define vascular bundle.

Physics

1) What are the two necessary conditions for a body to have uniform velocity?

2) What is the S.I unit of speed?

3) State one difference between speed and velocity?

4) A body covers a distance of 30 m in 1.5 minutes. What is the speed of the body?

5) Give an example of motion wherein the body undergoes roational as well as translatory motion.

CHEMISTRY

1. Identify the following as physical or chemical change.

• Melting of wax.

• Cutting of trees.

• Digestion of food.

• Sublimation of solid

• Dissolving CO₂ in water

• Rusting of iron.

• Tearing a piece of paper

• Glowing of electric bulb

• Boiling/freezing/condensation

2. What is a physical change? What is a chemical change?

BIOLOGY

Answer the following:

1. Ram is suffering from typhoid. Name the causative agent.

2. Which bacteria helps in the formation of curd?

3. How do microbes survive adverse environmental conditions?

4. Name the nitrogen fixing bacteria.

5. Which gas is produced from the manure of cattle?

PHYSICS

1. A bird flies with a maximum speed of 320 Km/hr. Calculate its speed in m/s.

2. A bus takes 30 minutes to travel a distance of 25 Km. Calculate the speed of the bus in Km/hr?

3. Classify the following as rectilinear , circular, oscillatory or periodic.

a) Motion of your hands while running.

b) Motion of a train on a straight bridge.

c) Motion of child on a see saw.

d) Motion of soldiers in a march past

Motion of a train on a straight bridge

4. A car is running at a speed of 60 Km/hr and takes 2 hrs to reach its destination. Calculate the distance travelled by the car.

CHEMISTRY

Balance the following equations:

a P + O₂ →  P₂O₅

b KNO₃ →  KNO₂ + O₂

c Fe(OH)₃ + H2SO4 →  Fe₂(SO₄)₃ + H₂O

d Fe + O₂ →  Fe2O3

e Ca(OH)₂ + HCl →  CaCl₂ + H₂O

BIOLOGY

Answer the following:

1 Name the different types of tissues present in the animals.

2 Write the importance of different types of muscular tissues in our body.

3 Draw and explain the structure of the nerve cell.

4 Differentiate between xylem and phloem.

5 Explain the different types of simple permanent tissue.