Name the forces acting on a plastic bucket containing water held above
ground level in your hand. Discuss why the forces acting on the bucket do
not bring a change in its state of motion.
An inflated balloon was pressed against a wall after it has been rubbed
with a piece of synthetic cloth. It was found that the balloon sticks to the
wall. What force might be responsible for the attraction between the balloon
and the wall?
Select the incorrect sentence
(a) Blood has matrix containing proteins, salts and hormones
(b) Two bones are connected with ligament
(c) Tendons are non-fibrous tissue and fragile
(d) Cartilage is a form of connective tissue
A blacksmith hammers a hot piece of iron while making a tool. How does
the force due to hammering affect the piece of iron?
Which is not a function of epidermis?
(a) Protection from adverse condition
(b) Gaseous exchange
(c) Conduction of water
(d) Transpiration
Meristematic tissues in plants are
(a) localised and permanent
(b) not limited to certain regions
(c) localised and dividing cells
(d) growing in volume
In the following situations identify the agent exerting the force and the
object on which it acts. State the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
(b) Taking out paste from a toothpaste tube.
(c) A load suspended from a spring while its other end is on a hook fixed
to a wall.
(d) An athlete making a high jump to clear the bar at a certain height.
Which muscles act involuntarily?
(i) Striated muscles
(ii) Smooth muscles
(iii) Cardiac muscles
(iv) Skeletal muslces
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
An archer stretches her bow while taking aim at the target. She then
releases the arrow, which begins to move towards the target. Based on
this information fill up the gaps in the following statements using the
following terms.
muscular, contact, non-contact, gravity, friction, shape, attraction
(a) To stretch the bow, the archer applies a force that causes a change
in its __________.
(b) The force applied by the archer to stretch the bow is an example of
__________ force.
(c) The type of force responsible for a change in the state of motion of the
arrow is an example of a __________ force.
(d) While the arrow moves towards its target, the forces acting on it are
due to __________ and that due to __________ of air.
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