CBSE Class 7th Science paper 2023 Solved-( English Medium) -

CBSE Class 7th Science paper – English Medium

Section – A (12×1=12 Marks)

Red litmus paper can turn blue. (True/False)
Answer: False
Throwing a ball into water is a chemical change. (True/False)
Answer: False
Dissolving sugar in water is a chemical change. (True/False)
Answer: False
A distance-time graph in uniform motion shows a straight line. (True/False)
Answer: True
How much time (hours and minutes) will it take to cover 360 km at a speed of 24 km/h?
Answer:
Time = Distance / Speed = 360 km ÷ 24 km/h = 15 hours
When an electric current flows through a wire, it becomes ___.
Answer: Magnetic
Light travels in a ___ and ___.
Answer: Straight line and wave form
___ and ___ are necessary for rusting of iron.
Answer: Oxygen and water vapor
Name the gas that plants use for food synthesis.
Answer: Carbon dioxide
Or:
Name the part of the plant involved in food-making.
Answer: Leaves
Some organisms share food and shelter, this relationship is called ___.
Answer: Parasitic relationship
Saliva converts starch into which substance?
Answer: Sugar (Glucose)
Name the two types of spherical mirrors.
Answer: Concave and convex mirrors
Or:
Which mirror is used in vehicles for rear-view?
Answer: Convex mirror

Section – B (Marks vary per question)

If a car is moving at a speed of 120 km/h, how much time will it take to cover 150 km?
Answer:
Time = Distance / Speed = 150 km ÷ 120 km/h = 1.25 hours (1 hour 15 minutes)
Or:
If Sohan traveled 15 km in a day, how many meters did he travel?
Answer: 15 km = 15,000 meters
A train covers 90 km in 12 minutes. Calculate its speed.
Answer:
Speed = Distance / Time = 90 km ÷ (12/60) hours = 450 km/h
On which effect of electric current is an electric fuse based?
Answer: Thermal effect
Why does rusting occur faster in coastal areas?
Answer: Due to high moisture and oxygen content
Or:
What is galvanization? How is it beneficial?
Answer: The process of coating iron with zinc to prevent rusting.
What happens when carbon dioxide is passed through lime water?
Answer: Lime water turns milky.
Or:
What happens when baking soda is added to vinegar?
Answer: Carbon dioxide gas and foam are produced.
Which type of mirror is used by dentists and why?
Answer: Concave mirror, as it forms a magnified and clear image.
Can we use a normal electrical wire as a fuse? Explain.
Answer: No, because normal wires can withstand high currents and do not melt easily.
Or:
Explain micropyle and germination.
Answer:
- Micropyle: A small pore in seeds for water absorption.
- Germination: The process by which a seed develops into a new plant.
Where is bile juice produced? Which nutrient does it help digest?
Answer:
- Bile is produced in the liver.
- It helps in fat digestion.
  Or:
  What are long bones? Mention their location and function.
  Answer:
- Long bones provide support and structure to the body (e.g., femur, humerus).
Explain neutralization reaction with an example.
Answer:
Example: HCl + NaOH → NaCl + H₂O
Define physical and chemical changes.
Answer:

Physical Change: Only the form changes (e.g., melting of ice).
Chemical Change: The composition changes (e.g., rusting of iron).

What is the common name of sodium hydrogen carbonate?
Answer: Baking soda

Section – C (3×2=6 Marks)

Question 12:

(i) Plants with branches arising from the base of the stem are called –
Answer: (b) Shrubs

(ii) Plants that cannot stand upright but spread on the ground are called –
Answer: (b) Creepers

(iii) Plants that grow upward with support are called –
Answer: (c) Climbers

Question 13 (Match the Following)

(A) Movement – (IV) Only movement of food
(B) Small intestine – (III) Site of complete digestion of food
(C) Gastric juice – (I) Digestion of proteins
(D) D.N.S – (II) Teeth
(E) Digestion – (V) Water, salt, sugar
(F) Large intestine – (VI) Absorption of water and salts