User Forum

Tarun carried out an experiment to compare the rate of evaporation of water. He used four different containers P, Q, R and S. He put 50 mL of water into each container and placed them at the same place. The temperature of water in all the containers was the same. After 5 hours, he observed the amount of water in each container and recorded his results in a table as shown below.

Which container has the least exposed surface?

AP
BQ
CR
DS

The diagrammatic representation shows the pulmonary and systemic circulations. Identify the parts labelled as a, b, c, and d and select the correct option.

Select the option which has kharif crops only.

ARice, Bajra, Pea
BMaize, Jowar, Bajra
CBean, Apple, Orange
DRadish, Cauliflower, Maize

Which of the following statements about Spongilla, leech, dolphin and penguin is correct?

A Penguin is homoiothermic while the remaining three are poikilothermic.
B Leech is found in fresh water form while all others are marine.
C Spongilla has special collared cells called choanocytes, not found in the remaining three.
D All are bilaterally symmetrical.

A few properties are listed as
I. Poor conductors of heat
II. High density
III. Lustrous
IV. Transparent
V. Low melting point
VI. Strong
Properties generally associated with plastics are

AI and VI only
BII and III only
CI, II and V only
DI, IV and VI only.

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