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A few redox reactions are given as :

Which of the following statements is incorrect about the given redox reactions?

A In reaction I, CuO is acting as an oxidising agent.
B In reaction II, C is oxidised.
C In reaction III, H₂O is reduced.
D In reaction IV, SnCl₂ is acting as an oxidising agent.

Study the given table carefully.

Metals P, Q, R and S could be respectively

A K, Al, Na and Cu
B Cu, Pb, Na and Al
C Ag, Al, Na and Pb
D Cu, Ca, K and Al

Three glass prisms A, B and C of the same refractive index are placed in contact with each other as shown in the figure with no air gap between the prisms.
A ray of light OP passes through the prism assembly and emerges as QR. The condition of minimum deviation is satisfied in the prisms


AA and C only
BB and C only
CA and B only
DA, B and C

Six equal resistances are connected between points P, Q and R as shown in the figure. The net resistance will be maximum between


A P and Q
B Q and R
C P and R
D Any two points.

New plants may be grown from groups of cells that are taken from other plants. The given diagram shows parts of a plant X.

Cell samples obtained from which of the labelled structures will grow into new plants that are genetically identical to plant X?

A P
B Q
C R
D S

The diagram shows a circuit in which all the switches are open.

Which of the following switch positions would give a resistance of 4 W between X and Y ?

In the given figure, rectangle, square, circle and triangle represents the regions of wheat, gram, maize and rice cultivation respectively.

Which area is cultivated by rice and maize only?

A9
B8
C2
D7

The given graph shows the hormonal changes during a normal menstrual cycle. What would be a likely consequence if the hormone represented by graph Q is lacking in an adult female?


AThe uterine lining might not be sufficiently stable to support an implanted embryo.
BLevels of the hormone represented by graph P would be higher than normal.
CFertilization of ovum would fail to occur.
DThere would be no significant effect since the functions of the hormones overlap.

Which of the following statements about the given reaction are not correct?

I. Fe₂O₃ is getting oxidised to Fe.
II. Fe₂O₃ is acting as a reducing agent.
III. CO is acting as a reducing agent.
IV. CO is getting reduced to CO₂.

AIII only
BI, II and IV
CII and IV
DI and III

A constant current of 3.0 A flows counter clockwise in the circular coil P as shown in figure.

What is the direction of the induced current in the coil Q on the right?

AClockwise
BCounter clockwise
COut of the page
DThere is no induced current