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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.

In the graph, O to C represents a moving body. Which of the following is correct for the motion along BC ?


A Forward with uniform velocity.
B Backward with non-uniform velocity.
C Backward with uniform velocity.
D Forward with non-uniform velocity.

In column I, three identical lamps P, Q and R are arranged in different configurations, while in column II the information about brightness of lamps are mentioned. Match column I with column II and select the correct option from the given codes. (Neglect resistance of connecting wires)


A (i) → (A, C), (ii) → (A), (iii) → (B, C), (iv) → (C, D)
B (i) → (C, D), (ii) → (B), (iii) → (B, D), (iv) → (A, B)
C (i) → (A), (ii) → (C, D), (iii) → (B, C), (iv) → (B)
D (i) → (B, D), (ii) → (C), (iii) → (B, C), (iv) → (A)

Refer to the given figure. What will be formed as the result of the process shown here?


A Humus
B Soil
C Air
D None of these