Chapter 14: Investigating Space - Science Mcqs for Grade 7 - Set 7

1)   The diameter of the lens of the largest telescope is

a. 5 m
b. 8.5 m
c. 10.4 m
d. 12.2 m
Answer  Explanation 

ANSWER: 10.4 m

Explanation:
No explanation is available for this question!


2)   The stars of the galaxy are continuously moving around the

a. center of sun
b. center of galaxy
c. center of milky way
d. all of above
Answer  Explanation 

ANSWER: center of galaxy

Explanation:
No explanation is available for this question!


3)   After every eleven years, the rate of sunspots on the surface of sun is

a. decreasing
b. increasing
c. lowering
d. isolating
Answer  Explanation 

ANSWER: increasing

Explanation:
No explanation is available for this question!


4)   The mass of 'Sirus A' is

a. 1.5 times of the Sun
b. 1.8 times of the Sun
c. 2.3 times of the Sun
d. 2.5 times of the Sun
Answer  Explanation 

ANSWER: 2.3 times of the Sun

Explanation:
No explanation is available for this question!


5)   After Big Bang, the period which Solar system took for coming into being was about

a. 9 thousand years
b. 18 thousand years
c. 9 billion years
d. 18 billion years
Answer  Explanation 

ANSWER: 9 billion years

Explanation:
No explanation is available for this question!


6)   When energy is produced, a gas emits. This gas is called

a. helium gas
b. hydrogen gas
c. nitrogen gas
d. oxygen gas
Answer  Explanation 

ANSWER: helium gas

Explanation:
No explanation is available for this question!


7)   American space probe has been studying sun since

a. 1995
b. 1996
c. 1997
d. 1998
Answer  Explanation 

ANSWER: 1995

Explanation:
No explanation is available for this question!


8)   A huge bulge is kept heating up until hydrogen gas begins to convert into

a. nitrogen gas
b. oxygen gas
c. helium gas
d. argon gas
Answer  Explanation 

ANSWER: helium gas

Explanation:
No explanation is available for this question!


9)   In fact our earth is just a tiny speck in a vast

a. space
b. universe
c. galaxy
d. solar system
Answer  Explanation 

ANSWER: universe

Explanation:
No explanation is available for this question!


10)   Besides energy, the explosions on the sun also produce

a. radiations
b. electromagnetic waves
c. sounds
d. friction
Answer  Explanation 

ANSWER: radiations

Explanation:
No explanation is available for this question!


11)   Waves travel through space at the speed of light i.e.

a. 30,000 km/s
b. 300,000 m/s
c. 3,000 m/s
d. 300,000 km/s
Answer  Explanation 

ANSWER: 300,000 km/s

Explanation:
No explanation is available for this question!


12)   Small radio telescopes are used instead

a. enormous dish aerial
b. reflecting telescopes
c. refracting telescopes
d. small dish aerial telescopes
Answer  Explanation 

ANSWER: enormous dish aerial

Explanation:
No explanation is available for this question!


13)   Scientists says that there is no proof that astrology has been used for prediction of

a. human behavior
b. myths
c. future
d. life span
Answer  Explanation 

ANSWER: future

Explanation:
No explanation is available for this question!


14)   A telescope that uses a single or a combination of curved mirrors, is also called

a. refracting telescopes
b. reflector
c. rarefaction telescope
d. reflection telescope
Answer  Explanation 

ANSWER: reflector

Explanation:
No explanation is available for this question!


15)   The sun is a glowing ball of hot gases which rotates in

a. space
b. earth
c. ovals
d. circles
Answer  Explanation 

ANSWER: space

Explanation:
No explanation is available for this question!


16)   Ancient name of constellations refer to

a. 77 areas
b. 88 areas
c. 99 areas
d. 66 areas
Answer  Explanation 

ANSWER: 88 areas

Explanation:
No explanation is available for this question!


17)   The 'sun' is about

a. 5,000 years old
b. 5 million years old
c. 5 billion years old
d. 5 trillion years old
Answer  Explanation 

ANSWER: 5 billion years old

Explanation:
No explanation is available for this question!


18)   In a plane mirror, light is reflected through

a. eyepiece lens
b. convex lens
c. concave lens
d. light mirror
Answer  Explanation 

ANSWER: eyepiece lens

Explanation:
No explanation is available for this question!


19)   Which is the most common type of galaxy in the universe?

a. spiral galaxy
b. irregular galaxy
c. elliptical galaxy
d. regular galaxy
Answer  Explanation 

ANSWER: elliptical galaxy

Explanation:
No explanation is available for this question!


20)   The rarest type of the 'galaxy' is

a. peculiar galaxy
b. lenticular galaxy
c. irregular galaxy
d. spiral galaxy
Answer  Explanation 

ANSWER: irregular galaxy

Explanation:
No explanation is available for this question!