CBSE Class 7 Science Advanced Physics Our Universe Very Short Answer Questions Set 03

Very Short Answer Questions

Question 1. State true or false: A body on the surface of the earth attracts the earth with a force equal to its weight.
Answer:
True. The body and the earth attract each other with equal and opposite forces.
In simple words: The body pulls the earth with the same force as the earth pulls the body.

Teacher's Note:
1. Gravitational forces come in equal pairs.
2. Give the reason when you can.

Question 2. State true or false: The constellation Aries has the shape of a bull.
Answer:
False. Aries is the ram. The bull is Taurus.
In simple words: Aries is the ram, not the bull.

Teacher's Note:
1. Learn the zodiac table.
2. Give the reason when you can.

Question 3. State true or false: Venus-13 is an artificial satellite.
Answer:
False. Venus-13 is a space probe used to study another planet.
In simple words: It travels to another planet instead of orbiting the earth.

Teacher's Note:
1. Satellites orbit the earth, probes go to other planets.
2. Give the reason when you can.

Question 4. Fill in the blank: A _______ is a dark funnel shaped cloud that reaches from the sky to the ground.
Answer:
tornado
In simple words: A tornado is the funnel-shaped cloud touching the ground.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 5. Fill in the blank: Low pressure system with very high speed wind revolving around it is known as a _______.
Answer:
cyclone
In simple words: A cyclone is a storm with very low pressure at its centre.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 6. Fill in the blank: When water vapour in the atmosphere condenses to raindrops it releases _______.
Answer:
heat
In simple words: Condensing vapour gives out heat, which warms the air.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 7. Fill in the blank: Wind currents are generated due to _______ on the earth.
Answer:
uneven heating
In simple words: The sun heats different places unequally, and this makes winds.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 8. Fill in the blank: Any two material bodies in the universe attract each other with a force called _________ force.
Answer:
gravitational
In simple words: The mutual pull between bodies is the gravitational force.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 9. Fill in the blank: The gravitational force of attraction between any two objects is directly proportional to the product of their _______.
Answer:
masses
In simple words: The more massive the bodies, the stronger the pull.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 10. Fill in the blank: Newton’s law of gravitation is called _______ law of gravitation.
Answer:
universal
In simple words: Newton’s law applies everywhere, so it is universal.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 11. Fill in the blank: ________ of a body is the force of attraction exerted by the earth on the body.
Answer:
Weight
In simple words: Weight is the earth’s pull on a body.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 12. Fill in the blank: In solar system, the value of g is maximum on _______.
Answer:
the Sun (274.1 m s⁻²)
In simple words: The sun is so massive that it has the strongest gravity in the solar system.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Question 13. Fill in the blank: SI unit of acceleration due to gravity is ______.
Answer:
m s⁻²
In simple words: g is measured in metres per second per second.

Teacher's Note:
1. Recall the term from the notes.
2. Spell it carefully.

Teacher's Note:
1. Match monsoon with seasonal wind first.
2. The calm centre of a cyclone is the eye.

Teacher's Note:
1. Spring means high, neap means low.
2. A freely falling body feels no weight.

Teacher's Note:
1. Aries is the ram.
2. Warm air rising out through exhaust fans is convection.