Question

c. The absorb gases through the membranes
d. They hold their breath underwater and come up to breathe air via nostrils.
C.
'd.
Q7. What is the similarity between the motion of the pendulum and the rotation of Earth arou
the Sun?
a. Both moves in a straight line.
Both follow circular motion.
b. Both show periodic motion.
Both rotate on their respective axis.
Q8. The image shows the setup of the reflection and Shadow formation. What can be conclud
by the observation?
Comb
Mirror
a. Shadow forms when light is blocked by an object, whereas reflection is bouncing of
b. Shadow forms when light passes through an object, whereas reflection is absorption
c. Shadows form when the light is blocked by an object, whereas reflection is absorptior
d. A shadow forms when the light passes through an object, whereas reflection is bound
09. The image represent an electric cell Which of these describes the structure of an electric​

Answer 1

Required Answer :

7) Both show periodic motion. (b)$\checkmark$

$\large \dashrightarrow$ In both cases of motion of the pendulum and rotation of the earth, same motion repeats itself after equal intervals of time. Thus, both show periodic motion.

8) Shadow forms when light is blocked by an object, whereas reflection is bouncing of light (a) $\checkmark$

$\large \dashrightarrow$ Explanation

• A shadow is formed when an opaque object blocks its path and then a dark patch is formed called shadow.
• A reflection is the bouncing or reflecting back of light when light rays strike on the surface.

[• When light is absorbed , it is called absorption of light.

• When light is passed through the object , it is called transmission of light.]

_______________________________

$\Large \dashrightarrow$ Some Extra Information :

• Motion : A body is said to be in motion when it changes it position with respect to time and the reference point.

Some types of motion are :-

• Rectilinear motion
• Curvilinear motion
• Random motion
• Oscillatory motion
• Periodic motion
• Circular motion