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After jumping out from the plane, a parachutist falls 80 m without friction. When he opens up the parachute, he decelerates at 2 m s^-2. He reaches the ground with a speed of 4 m s^-1. How long did the parachutist spend his time in the air? (Take g = 10 m s^-2)

A 4 s
B 16 s
C 18 s
D 22 s

Following animals have been paired based on the manner in which they obtain and consume their food.

Select the option that correctly pairs animals on the

The pressure by the tyres of a sedan car is P. The contact surface area of each tyre with the floor is A. Find the new pressure by the tyres when air is released from the tyres and the contact surface area of each tyre with the floor is increased to 1.25 A.

A1.25 P
B0.8 P
C1.67 P
D0.25 P

Read the given passage carefully and answer the following questions.
The constituents of a heterogeneous mixture are X, Y and Z. If mixture containing X and Y is taken, X can be separated using magnetic separation from Y. If mixture containing Y and Z is taken, the two can be separated using evaporation method.

The different states of X, Y and Z respectively are -

A Solid, Solid, Liquid
B Solid, Liquid, Solid
C All are liquids
D All are solids.

Read the given relationships and select the option that will correctly complete them.
I. Hemp : Bast fibre :: L : Leaf fibre
II. Cotton : Ginning :: M : Reeling
III. Wool : Burning hair :: N : Burning paper
IV. Spinning : Charkha :: O : Handloom
L-----M-----N-----O

ASilk cotton---Wool---Acrylic---Knitting
BCoir---Nylon---Silk---Knitting
CRayon---Jute---Shahtoosh---Weaving
DSisal---Silk---Cotton---Cotton

Ruchika conducted an experiment to test the nature of four different samples. She noted down her observations in the given table.

Which of the following conclusions can be drawn from this experiment?

AP and R are basic, Q is acidic and S is neutral in nature.
B P is acidic, Q is basic, R and S are neutral in nature.
CP and R are acidic, Q is basic and S is neutral in nature.
DP is neutral, Q and R are basic and S is acidic in nature.

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

Refer to the given picture. Select the option that gives correct matching of labelled part with its examples.


AY - Clove, Z - Cauliflower
BW - Apple, V - Potato
CU - Carrot, W - Tomato
DX - Broccoli, V - Sweet potato

The given diagram shows blood circulation pathway in the heart. Which of the following correctly shows the relative amount of oxygen and carbon dioxide at P, Q, R and S?


AMore CO₂ - R; More O₂ - P, Q, S
BMore CO₂ - Q and R; More O₂ - P and S
CMore CO₂ - S; More O₂ - R
DMore CO₂ - P and Q; More O₂ - R and S

A point object P moves towards a convex mirror with a constant speed v, along its optic axis. The speed of the image


AIs always less than v
BIs always more than v
CIs equal to v
DDecreases as P comes closer to the mirror.