User Forum

Which of these inclined planes would be most efficient to use to move an object upward?

A
B
C
D

Group the given figures into three classes on the basis of their identical properties using each figure only once.


A1, 5, 7; 2, 4, 6; 3, 8, 9
B1, 5, 7; 2, 4, 8; 3, 6, 9
C1, 5, 7; 2, 3, 6; 4, 8, 9
D1, 5, 7; 2, 8, 9; 3, 4, 6

Select the incorrect match.

A Fermentation – Occurs in absence of oxygen and yields very little energy
B Internal respiration – Exchange of gases between blood and body cells
C Exhalation – Decrease in air pressure inside the lungs causes air to move out from the lungs
D Stomata – Present on the surface of leaves and young stems.

Lalita carried out the following experiment. She took a torch and covered the glass of torch with her palm in a dark place. She switched on the torch and observed that the light of torch passes out of her palm but not clearly.
What do you conclude from this experiment?


ALight is translucent
BLight is opaque
CPalm is opaque
DPalm is translucent

There is a mistake in the given classification table.

Which of the following is placed incorrectly in the groups?

A Wool
B Graphite
C Iron
D Silver

Find the number of triangles formed in the given figure.


A20
B28
C32
DNone of these

Maximum number of molecules are present in ____.

A 4.9 × 10^–3 mg of H₂SO₄
B 4 × 10²³ molecules of SO₂
C 10 g of N₂
D 1.5 moles of NH₃

Which of the following numbers will be obtained, if the second digit of the greatest number is subtracted from the second digit of the smallest number after adding one to each of the numbers?
427 581 839 275 589

A1
B2
C3
D4

Study the given family tree of Saanvi.
Select the correct option regarding it.


A Saanvi has two cousins.
B Saanvi has two brothers and one sister.
C Among the two aunts of Saanvi, only one is married.
D Saanvi’s grandfather has three daughters and one son.

Alia is going to stay at a cold place. She will need all of the following clothing items except __________.

A
B
C
D