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Three hydrocarbons P, Q and R have carbon which combine with hydrogen in the ratio of 3 : 2 : 1 respectively. Which of the following is incorrect about the reactions shown by P, Q and R?

A P does not undergo addition reactions.
B Both Q and R decolourise bromine water.
C Both Q and R give white precipitate with AgNO₃ solution dissolved in NH₄OH.
D None of these.

In the given circuit diagram, S₁, S₂ and S₃ are switches.Which of the following switch combinations is correct for the lamp to glow?

A relationship between a consumer and producer is best illustrated by a

A Snake eating a bird
B Tree absorbing minerals
C Lion hunting a deer
D Deer eating grass.

When Asha suspended four bars of different materials from a pole and brought the North pole of a bar magnet near part P and Q of each bar one by one as shown in figure, then observations she recorded are as follows:

Which of the following sets correctly represents metal bars I, II, III and IV?

In the given food web, an increase in the population of bulbul is likely to cause _________.


A Increase in grasshopper and snake populations
B Decrease in plant and caterpillar populations
C Increase in grasshopper and caterpillar populations
D None of these

Megha is standing in a line. She is the fourth person from the front and thirteenth person from the back. How many persons are there in the line?

A 14
B 15
C 16
D 17

Which of the following groups of animals does not possess vertebral column?

A
B
C
D

Select the symbol that indicate the weather in which we need to wear both the objects shown in the box.


A
B
C
D

Which of the following is/are correctly matched?

A mirror can form images but a plane glass slab cannot. This is because a mirror

AReflects light while a plane glass slab absorbs light
BRefracts light while a plane glass slab reflects light
CReflects light while a plane glass slab refracts light
DRefracts light while a plane glass slab absorbs light.