User Forum

Which of the following statements are correct?
(i) Obsidian is the lightest rock in the world and is known as natural glass.
(ii) Shale is formed of clay particles that have been hardened together under high pressure.
(iii) Basalt is rich in minerals like iron and magnesium.
(iv) Bauxite is an ore of iron.

A(i) and (iv) only
B(ii) and (iv) only
C(ii) and (iii) only
D(i) and (iii) only

Observe the given figure carefully and select the correct statement.


AX is sodium hydroxide and Y is hydrochloric acid.
BGas Z is hydrogen gas which turns lime water milky.
CLime water turns milky due to the formation of calcium bicarbonate.
DThe evolved gas ‘Z’ forms carbonic acid when dissolved in water.

A person of height 3.2 m stands on the ground 1 m in front of a vertical plane mirror. The bottom edge of the mirror is on the ground. Then select the correct statement(s) regarding it.
(i) The minimum length of the mirror to see the full image should be 3.2 m.
(ii) The minimum length of the mirror to see the full image should be 1.6 m.
(iii) The length of mirror required to observe the full image gets reduced when the person walks towards the mirror.
(iv) The length of mirror required to observe the full image get increased when the person walks away from the mirror.

A(i) only
B(ii) and (iii) only
C(ii) only
D(i) and (iv) only

The given graph represents the motion of a moving object. Select the correct statements regarding it.
(i) The object is not stationary at time T.
(ii) The object is moving with uniform velocity.
(iii) The object is not at starting position at time T/2.
(iv) The area of P and Q regions of the graph are same.


A(i) and (iii) only
B(i), (ii) and (iv) only
C(ii), (iii) and (iv) only
D(i), (ii), (iii) and (iv)

Which of the following is an example of physical change?

A Burning of paper
B Decomposition of fruits
C Baking of cake
D Melting of chocolate

Which of the following statements are correct?
(i) Terrace farming is usually done in plain areas.
(ii) Loamy soil possesses the right water holding capacity for plant growth.
(iii) Wheat crop grows best in loamy soil.
(iv) Biological weathering is caused by living organisms such as lichens.

A(i) and (ii) only
B(iii) and (iv) only
C(ii), (iii) and (iv) only
D(i) only

Select the option that correctly classifies the plants in the given box into food grain crops and plantation crops.

Read the passage given below and answer question
Two vessels are air-filled. Vessel 1 is cylindrical in shape whereas Vessel 2 is rectangular in shape. A force of 5 N is applied to press both the vessels. Dimensions for both vessels are given in figures.

In which of the following conditions, the pressure experienced by both the upper surfaces of vessels 1 and 2 will be equal

AHeight of vessel 1 = Height of vessel 2
BArea of upper surface of vessel 1 = Area of upper surface of vessel 2
CRadius and height of vessel 1 = Height and width of vessel 2
DPressure experienced is independent of dimensions.

The diagram below represents a cell of a green plant.

Solar energy is used to produce energy-rich compounds in structure

AA
BC
CD
DE

Which of the following statements is incorrect?

ACFCs released from refrigerators and aerosols damage ozone layer.
BExcess of carbon monoxide in the atmosphere causes global warming.
CParticulate matter is an air pollutant that consists of soot, flyash, dust etc.
DPolluted water bodies have higher BOD.