There are many plants growing healthily in a green house. Which of the following factors will affect the amount of oxygen and carbon dioxide in a greenhouse on a sunny day?
(i) Amount of nitrogen gas in the air
(ii) Amount of sunlight received by the plants
(iii) Amount of water vapour in the air
(iv) Number of plants in the greenhouse
A(i) and (iii) only
B(ii), (iii) and (iv) only
C(i), (ii) and (iv) only
DAll of these
A toy car is released from point Q of the ramp and travels towards point P. What is/are the force(s) responsible for pulling the car towards point P?
(A) Weight of the car
(B) Earth’s gravity
(C) Earth’s magnetic field
(D) Frictional force between the wheels and the ramp
A (B) only
B (A) and (B) only
C (B) and (D) only
D (A), (B), (C) and (D)
weight of the car should not be called a force. Gravity is the only force that is pulling the car here. answer should be A
Electrolysis of a solution of sodium chloride produces
A Hydrogen gas at anode and chlorine at cathode
B Hydrogen gas at cathode, chlorine at anode and sodium hydroxide
C Hydrogen gas at anode and sodium hydroxide at cathode
D Chlorine gas at anode and sodium hydroxide at cathode.
When a hand blender is switched on, ________________ energy changes to ___________ and ___________ energy.
A Mechanical, Sound, Heat
B Sound, Heat, Mechanical
C Electrical, Heat, Potential
D Electrical, Kinetic, Sound
A hand blender runs on electricity. When it is switched on, its blades rotate and a sound is also produced as the motor starts. Thus, electrical energy changes into kinetic energy and sound energy.
Study the given Venn diagram.
Identify points 1, 2 and 3.
|A||Melting of ice||Boiling of rice||Burning of a candle|
|B||Burning of paper||Rusting of iron||Cutting of fruits|
|C||Breaking of a glass||Baking a cake||Burning of LPG in kitchen|
|D||Tearing of paper||Evaporation of water||Making lemonade|
Namit was asked to pair one outdoor and one indoor activity. He made four pairs, but he made one incorrect pair. Select the incorrect pair.
ALudo and Carrom
BBadminton and Table tennis
CFootball and Chess
DBoth A and B
badminton is also an indoor activity