If + = 150, + + = 230 and + + = 220, then the value of 5 + = ____?__.
A young plant wilts when it is dug up, even if it is later re-planted at the same place. What can be the reason for this?
AThe leaves lose more water when the plant is replanted.
BThe roots cannot take up mineral salts because digging of soil decreases mineral content.
CThe stem cannot transport water because digging always causes it to break.
DThe surface area of the roots gets reduced on digging up.
how does the surface area reduce on digging up?
The hottest planet in the solar system is ____.
The ans. of this question is Venus because though Mercury is the closest planet to sun, Venus has atmosphere of carbon dioxide in which the hot air gets trapped.
You are standing upright in a room in front of a vertical mirror. In this mirror, you can see from your position, only the upper two-third part of your body. You wish to see the full image of your body in the mirror. Which combination of the following three courses of action will achieve this?
I. Move away from the mirror
II. Move towards the mirror
III. Use a mirror whose height will allow you to see your full image
A I only
B II only
C III only
D Either I or III
How come it is only option C and not D ?
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.