User Forum

Observe the given experimental set-up carefully.

Which of the following could be the possible observation and inference drawn?

A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.

Select the odd one out.

A

B

C

D

Four students P, Q, R and S noted the initial colour of the solutions kept in beakers I, II, III and IV. After inserting zinc rods in each solution and leaving them undisturbed for two hours, the colour of each solution was again noted in the form of table given below :


Which student noted the colour change in all the four beakers correctly?

A P
B Q
C R
D S

(A) Separation of seeds from cotton bolls is called winnowing.

(B) Weaving and spinning are the two main processes of making fabrics.

(C) Weaving is arranging two sets of yarn together to make a fabric.

(D) Silk is obtained from cocoon.

Select the INCORRECT statement regarding shadow.

AShadow is formed when light cannot pass through an object.
BShadow is formed on the opposite side of the light source.
CShadow is of different sizes at different times of the day.
DLength of the shadow changes with the change in position of the Earth.

Which of the following figures has the equal area shaded ?

(A) 1, 2 and 3

(B) 1 and 4

(C) 2 and 4

(D) 1 and 2

A group of students carried out an experiment to find out how the force applied to pull the toy car up the ramp varied with the height of the ramp as shown in the given diagram. They varied the height by changing the number of the blocks.

Which one of the following graphs best illustrates their results?

(A)

(B)

(C)

(D)

Rock X floats on water while rock Y wears easily when rubbed.
Which of the following options correctly identifies these rocks?