The given picture shows a river flowing downstream towards the sea. Situated near the river is a factory which occasionally discharges waste water into the river and, a farm where pesticide is used. A water treatment plant which supplies water for home use is to be built. The water treatment plant treats water which is pumped into it from the river. Which position would be suitable for the treatment plant?
A small cardboard is kept between the wall and the
bulb in a room. At which position the shadow formed
A The cardboard is held close to the wall.
B The cardboard is held at mid position between them.
C The cardboard is held close to the bulb.
D Both a and c
The answer isCBut I think it should be A.I actually tried it and it was was the sharpest when held close to the wall.
The given diagram shows the positions of four different objects after they have been dropped into a trough of water. Which of the following correctly matches the objects used?
A 1- Ping pong ball, 2 – marble, 3 - crushed aluminium foil, 4 - iron rod
B 1 – Ping pong ball, 2 – iron rod, 3 – crushed aluminium foil, 4 – marble
C 1 – Crushed aluminium foil, 2 – ping pong ball, 3 – iron rod, 4 – marble
D1 – Crushed aluminium foil, 2 – iron rod, 3 – marble, 4 – ping pong ball
plz explain how
A food chain in an aquarium is shown below.
Water plants → Guppy fish → Angelfish →Snakeheads
If the snakeheads were removed, which graph shows the changes in the population of organisms in the aquarium?
Sunita prepared two cups of water (one hot and one cold), and then covered them. Look carefully at the results she obtained after 2 minutes.
Which of the following statements about the results is not true?
(B) Water particles from the hot water condense when they meet the cool inner surface of the metal cover.
(C) The insulated sides reduce heat loss or gain from the sides of the cup.
(D) When the heated particles of water vapour present in the air above the hot water hit the cold cover, they lose heat and condense.
what is the correct answer and how ?