Why are the days on different planets of different time period?
AThe planets revolve around the Sun in different orbits.
BThe planets rotate on their axis at different speeds.
CThe planets revolve around the Sun at different speeds.
DThe planets are at different distances from the Sun.
A factory was set up in an area which used to discharge its untreated waste down the pipe into nearby water body. After few years the factory was shut down due to some legal action. The given graph shows the changes in the populations of two organisms X and Y over time, before the setting of factory and after it was shut down. Identify X and Y and select the correct option.
A X could be bacteria and Y could be fish.
B X could be prawn and Y and could be a submerged aquatic plant.
C X could be a water bird and Y could be algae.
D X could be algae and Y could be bacteria.
Read the given passage and fill in the blanks by choosing an appropriate option.
Iron nails when new are grey and bright. When exposed to (i), they get covered with a (ii) coating. This process is called (iii) and it is a (iv) change.
|A||Moist air||Grey||Corrosion||Chemical, reversible|
|B||Air and water||Reddish brown||Rusting||Chemical, irreversible|
|C||Oxygen in air||Green||Rancidity||Physical, irreversible|
|D||Nitrogen in air||Reddish brown||Galvani-sation||Chemical, irreversible|
Study the classification diagram as shown and identify
W, X, Y and Z.
|C||Tracing paper||Water||Frosted glass||Mist|
|D||Wooden ruler||Dough||Tracing paper||Haze|
D is the answer.
Ans 1: (Master Answer)
Wooden ruler is opaque, and it has a definite shape. So, it can be W.
Dough is opaque, and it doesn’t have a definite shape. So, it can be X.
Tracing paper is translucent and has a definite shape. So, it can be Y.
Haze has no definite shape, and it is translucent. So, it can be Z. Hence, the correct option is D.
A ball is dropped from a spacecraft revolving the earth at a height of 100 km. What will happen to the ball?
(a) It will continue to move with the same speed along the original orbit of spacecraft.
(b) It will move with the same speed, tangentially to the spacecraft.
(c) It will go very far in the space.
(d) It will fall down to earth gradually.
Refer to the given Venn diagram and select the correct statement regarding animals X, Y and Z.
AX could possess feathers whereas Y could possess scales.
BY could be oviparous organism whereas Z could be viviparous organism.
CBoth X and Z could regulate their body temperature.
DAll of these
Which of these is an incorrect statement?
AJute plants are harvested after flowering stage.
BRetting is done to soften the tissues so that fibres can be separated easily.
CKnitting is done by machines only.
DWeaving is a process of arranging two sets of yarns together to make a fabric.
Preeti suddenly falls down while playing on a swing. She gets an injury in her chest.
Now she has difficulty in breathing and she also complains of pain in chest while
laughing, yawning, etc. Which of these body organs has been damaged?
Why the answer is lungs, why not heart?