A box is made up of shiny substance 'X'. When dropped on the floor, the box did not break and produced a
ringing sound. What could be the substance X?
An astronaut is in a space station in an environment which has no acceleration due to gravity. The space station has a generator which constantly heats up the air on one side of the cabin. Which of the following statements is true about the convection currents caused by heating of air by the generator?
ACool air moves in, as the air heated by the generator rises up.
BNo conventional convection currents are set up.
CHot air, being heavy, merges into the ground and cool air moves in.
DA vacuum sets up near the generator, as all the air is sucked by it.
The branches of some trees grow over a wide area to ________ .
A lose as much water as possible
B get as much sunlight as possible
C get as much rainwater as possible
D provide a home to as many insects and birds as possible
When a person breathes out, what happens to the diaphragm and rib cage?
|A||Becomes flatten||Moves downwards
|B||Becomes flatten||Moves outwards
Read the given statements and select the correct option.
Statement 1 : Anaerobic respiration occurs in skeletal muscles of humans.
Statement 2 : Accumulation of lactic acid in the skeletal muscles lead to muscle fatigue.
ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true and statement 2 is false.
DBoth statements 1 and 2 are false.
A rectangular block of metal has an area A and height
h is resting on a table. If another block of area A/2
but height 2h of the same metal is placed on the table,
A The weight of the first block is greater than the second.
B The pressure on the table due to the second block is more.
C The pressure on the table due to the first block is more.
D The thrust due to the first block is more.
Refer to the given food web
and select the incorrect option
A V, W, X and U serve as top consumers in the given food web.
B The energy transferred from Q to U may be equal to or higher than the energy transferred from T to U.
C There are 12 food chains in the given food web, out of which 4 food chains have four trophic levels and rest have 3 trophic levels.
D Q, R, S and T are herbivores in the given food web.