User Forum

For the given network, if R_ij is equivalent resistance between the points i, j of the circuit then, match the resistances in column I with their respective equivalent values in column II and select the correct option from the given codes.

Q₁, Q₂ and Q₃ are three balloons ascending with velocities 2v, 4v and 6v, respectively. If an object X of some mass m is dropped from each of them when they are at same height, then which one of the following statements is correct?

AX from balloon Q₃ reaches the ground first.
BX from balloon Q₁ reaches the ground first.
CX from balloon Q₂ reaches the ground first.
DX from all the three balloons reaches ground simultaneously.

Read the given statement and select the option that correctly fills in the given blanks. The number of days between two consecutive Waxing Gibbous Moons is approximately __(i)__ and the number of days between two consecutive Half Moons is approximately __(ii)__ .

A(i)-7, (ii)-14
B(i)-28, (ii)-28
C(i)-14, (ii)-14
D(i)-28, (ii)-14

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.