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Identify the elements W, X, Y and Z from the given information.
W : Best conductor of electricity
X : Essential component of haemoglobin
Y : Hardest natural substance
Z : Source of energy in sun and stars

Read the given passage and answer the following questions.
Three different cropping patterns, viz. X, Y and Z are applied to get the maximum benefits from a crop field. In X, two or more crops are grown together in the same field in different rows or strips. In Y also, two or more crops are grown together but not in definite rows. In Z, different crops are grown on a piece of land in a pre-planned succession. These cropping patterns maintain soil fertility and crop yield.
Which of the following options is correct regarding criteria of crop selection for these cropping patterns?

A In Z, the crops used must have different maturation times.
B In Y, the crops used must require the similar amount and type of nutrition.
C In X, the crops used should have different sowing and harvesting dates.
D In Z, the crops should not be of different growth habits, i.e., should be either both tall or both dwarf.

The velocity-time graph shows the motion of a particle moving in a straight line. What may be deduced about the resultant force acting on the particle during the first 2 s and after 2 s?

Select the incorrect match.

An object is accelerating under the influence of a force F₁ on a frictionless surface. A while later, an opposing force F₂ of the same magnitude acts on it as shown in the figure. What will happen to the object?


AThe object will slow down.
BThe object will move at constant velocity.
CThe object will come to rest immediately after the opposing force acts on it.
DThe object will move in the opposite direction.

Study the given flow chart based on states of matter. Which of the following is correct regarding this?

In a hydro power plant,

A Potential energy possessed by stored water is converted into electricity
B Kinetic energy possessed by stored water is converted into potential energy
C Electricity is extracted from water
D Water is converted into steam to produce electricity.

Manita conducted an experiment wherein she took a flowering plant and covered all its flowers with a plastic bag for two weeks. She noticed that during the two weeks’ duration the fruits started to develop from the flowers on the plant. Which of the following could not be the reason for development of fruits?

AThe flowers were already pollinated before Manita enclosed them in the plastic bag.
BThe flowers are bisexual.
CThe anthers and stigmas of the flowers mature at about the same time.
DThe flowers contain only the male reproductive organs.

Refer to the given food web. What will happen if all T organisms are removed from the given food web?


AThe population of R and S will increase.
BThe population of Q will decrease.
CThe population of R will increase but population of S will decrease.
DBoth A and B

Amit walks 20 metres towards East. Turning to the right he walks 50 metres, then turning left he walks 20 metres, then turning left he walks 80 metres, then turning left he walks 40 metres and stops. In what direction is he with respect to his starting point?

A South
B West
C North
D East