User Forum

Read the following statements.
(P) _______ is the upper limit of the ground water that fills the space in soil and rocks.
(Q) _______ are the places between layers of hard rocks that collect seeped water.
(R) The groundwater gets recharged by _______.
(S) Ground water is almost free of _______.
Select the option that correctly fills up the blanks in any two statements.

AQ - Infiltration, S - Impurities
BP - Infiltration, R - Aquifer
CR - Pump, S - Minerals
DQ - Aquifer, R - Infiltration.

If amount taken for each substance is 18 g then, which of the following represents the correct order of number of atoms in them?
(Given : Atomic mass of H = 1 u, C = 12 u, O = 16 u)

A H₂O > CO₂ > CH₄ > O₂
B CH₄ > H₂O > O₂ > CO₂
C CO₂ > H₂O > CH₄ > O₂
D CH₄ > H₂O > CO₂ > O₂

Ishaan tested the nature of a few common substances with different indicators and recorded his observations as follows :
Substance P turned methyl orange yellow.
Substance Q turned phenolphthalein colourless.
Substance R did not have any effect on blue or red litmus.
Substance S turned China rose indicator green.
P, Q, R and S could be respectively

A Lemon juice, fermented milk, salt solution and milk of magnesia.
B Sugar solution, vinegar, water and curd.
C Lime water, apple juice, sugar solution and saliva
D None of these.

Observe the given figure carefully and choose the incorrect statement(s).


1. Large volume of acid should be added to a small volume of water slowly.
2. The figure represents the process of concentrating dilute H₂SO₄.
3. The process involves release of a large amount of heat.
4. Water should not be stirred.

A 1 and 4 only
B 2 and 3 only
C 1, 2 and 4 only
D 2 only

Read the given statements and select the correct option.
Statement 1 : Baking soda does not taste sour.
Statement 2 : Bases are sour in taste while acids are bitter in taste.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.

Mr. Ramakant, a science teacher organised a quiz in the class. He stated few applications of non-metals and asked students to guess the names of the non-metals. Mark the correct option.

A Non-metals used in fertilisers-K, Cl
B Non-metal used in water purification process-Br
C Non-metal used in crackers-N
D Non-metal used as an antiseptic-I

Read the given passage carefully.
Houseflies go through (A) stages in their life cycle. The housefly lays hundreds of eggs at a time. Each egg hatches to produce a young one called a (B). The larva of a housefly is called (C). After some days, the larva becomes barrel-shaped. It is now called a (D). The pupa is covered by a (E). The cocoon breaks open in a week and a young housefly comes out.
Select the option which correctly fills any three blanks.

A a - four, c - nymph, d - cocoon
B b - larva, d - pupa, e - cocoon
C a - three, b - larva, d - pupa
D c - maggot, d - pupa, e - nymph

Abhishek set up different kinds of conditions on each of the four corners of a cardboard. He placed some woodlice in the centre of the cardboard and waited for twenty minutes. The result is shown in the diagram below.

Select the correct option regarding this.

A The aim of this experiment is to find out the conditions that woodlice preferred to live in.
B Woodlice like to live in dark and damp places.
C Woodlice like bright and dry places.
D Both A and B.

Study the given classification chart of animals carefully and identify the animals (a-d).