A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is
D None of these
Please help me to understand this question. How is this incident convergent.
The given diagram shows a magnet being used to pick up a steel bar. The north pole of the magnet is close to the centre of the steel bar as shown. What are the poles induced in the steel bar at X, Y and Z?
Earthquakes at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and the destructive energy at A and B can be compared as
(a) Tremors at B are two times those at place A
(b) Tremors at B are four times those at place A
(c) Tremors at B are 100 times those at place A
(d) Tremors at B are 1000 times those at place A
Train A travels with a speed of 80 km/h from Delhi to Chennai. Train B travels from Delhi to Chennai with a speed of 75 km/h. Which of the following statements is true?
(a) Trains A and B have the same velocity as they are travelling in the same direction.
(b) Trains A and B have same velocity but different speed.
(c) Trains A and B have different speeds and different velocities.
(d) Can't say, as the given information is not enough.
Mr. Nair shines his torchlight at a stone, as shown in the diagram.
What can he do to get a bigger shadow on the screen?
(1) Move the stone nearer to the torchlight.
(2) Move the torchlight further away from the stone.
(3) Move the screen away from the stone.
(a) 1 only
(b) 1 and 2
(c) 2 and 3
(d) 1 and 3
Refer to the given flow chart showing flow of energy in a food chain.
Select the correct statement regarding P, Q, R and S.
(i) S helps in cleaning of environment as well as recycling of nutrients.
(ii) The role of Q comes when plants and animals die.
(iii) P operate at all levels of food chain.
(iv) R eats other animals and get its food indirectly from P.
A (i) and (iv) only
B (i), (iii) and (iv) only
C (iii) and (iv) only
D (i), (ii), (iii) and (iv)