Question

1. State the formula for acceleration,
2. Name the disease caused by the deficiency of vitamin D.
a. Goitre b. Ben Beric. Rickets d. Scurvy
Which tissue makes up the husk of coconut?
LE
a. Parenchyma b. Collenchyma c. Sclerenchyma d. Aerencyhma
3. Identify the dispersed phase and dispersion medium for the following
a Fog
h) Shavine cream

SHIP
4. Against what disease BCG vaccine is glven?
a cholera b. Tuberculosis e AIDS d. Chickenpox
li)Name the tissue responsible for movement in our body
5. State the orinciple of conservation of linear momentum,
​

Answer 1

${\underline{\sf{Answer}}}$

1) Acceleration :

It is defined as the rate of change of velocity.

$\rm{Acceleration=\dfrac{Change\:in\:Velocity}{Time\:interval}}$

• Acceleration is a vector quantity.
• SI unit of Acceleration is m/s²
• Dimension of Acceleration: $\sf\:[M^0LT{}^{-2}]$

2) a) The disease caused by the deficiency of vitamin D is Rickets . It is a bone disorder .

Symptoms :

•   Pain in the bones of arms, legs, pelvis, and spine
• Short height
• Softening of bones etc .

b) Husk of coconut is made of Sclerenchyma.

Sclerenchyma is the simple permanent tissue , it provides strength to plant , that's why it's also called supportive tissues of the plant .

3) a) Fog

Dispersed phase = liquid ( water drop )

Dispersed Medium = air ( gas )

b) Shaving cream

Dispersed phase = liquid

Dispersed Medium = gas

4) a) BCG vaccine is given against Tuberculosis disease .

This vaccine given to infants , for prevention of Tuberculosis.

Tuberculosis

• It is contagious bacterial disease
• It is caused by bacteria [Mycobacterium tuberculosis]
• It is communicable infectious disease

b) Muscular tissue is responsible for the movement of our body. It is made of fibers and Muscular cells.They also help to maintain body posture and position.

Muscular tissue are three types :

1. Skeletal
2. Cardiac
3. Smooth

5) Conservation of Momentum :

According to the law of conservation of Momentum: If total the external force acting on the system is zero ,$\sf\sum\vec{F}_{ext}=0$ Then ,

$\rm{Initial\:Momentum=Final\:Momentum}$

• It is a universal law
• Equivalent to Newton's third law of motion.

Application of law of conservation of Momentum

1. Firing a bullet from a gun
2. Rocket propulsion
3. Explosion of bomb etc .