User Forum

Which of the following statement(s) is/are incorrect?
(i) Two thin woollen sweaters are warmer than a thick woollen sweater.
(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides.
(iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding.

A Only (i) and (iii)
B Only (ii) and (iii)
C Only (iii)
D Only (i)

Select the odd one out.

A
B
C
D

Which of the following is the correct difference between weaving and knitting?

A Weaving is done with machine while knitting is done with hand only.
B Weaving uses two sets of yarn while knitting involves only one yarn.
C Weaving is done for silk only while knitting is done for wool only.
D All of these

Sohan has three identical roses of different colours; red, yellow and pink. He shines a torch on the three roses one-by-one and gets a shadow on the wall in each case. Richa who is observing the shadows formed on the wall can

ADistinguish shadow of the red rose only
BDistinguish shadows of the red and yellow roses only
CDistinguish shadows of all the three roses
DNever distinguish the shadows of the three roses.

Study the given diagrams showing the cross-section of two flowers. Which of the following statements is/are correct regarding them?

(i) Both flowers will produce female gametes.
(ii) Flower X is a bisexual flower and flower Y is a male flower.
(iii) Self pollination can take place in flower Y only.

A(i) only
B(iii) only
C(i) and (ii)
DNone of these

On a cold day, it is hard to open the metallic lid of a tight glass container. But when you gently heat the neck you can easily open the lid. Why?

AOn heating, glass expands and lid contracts.
BOn heating, lid expands more than the neck and thus slides easily.
CNeck becomes slippery on heating.
DLid of the bottle cannot bear the heat.

Read the given passage and answer the following questions.
Siddhi studied forelimbs of three organisms and described them as follows :
Organism X – Long and short bones, covered with muscles, used for running.
Organism Y – Long and short bones, covered with feathers used for flying.
Organism Z – A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
Select the option that shows correct relationship between these organisms.

A
B
C
D

Which graph shows the effect of temperature on the rate of photosynthesis of the aquatic plants such as Elodea?

A
B
C
D