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Read the given paragraph where few words have been italicised.
Troposphere is the first layer of atmosphere closest to the Earth. Mesosphere is an important layer as it contains ozone gas that absorbs harmful ultraviolet rays of the Sun and protects us from its harmful effects. Stratosphere is the layer where most meteorites burn up before reaching the Earth surface. Thermosphere is the upper most layer of Earth's atmosphere.
Select the incorrect statement regarding them.

A Thermosphere should not be changed as it is correctly mentioned.
B Mesosphere and stratosphere should be interchanged.
C Thermosphere should be changed to exosphere.
D Thermosphere and troposphere should be interchanged.

Select the incorrect match.

AHinge joint – Knee
BHinge joint – Knee
CPivot joint – Elbow
DPivot joint – Elbow

A man who is standing at point X between two parallel walls fires a pistol. He hears first two echoes after 0.5 s and 0.8 s respectively. A further echo is heard, after firing, at a time of _________.


A1.1s
B1.3s
C2.2s
D2.6s

Which of the following show the characteristics of a living thing?
1. A football decreases in size when deflated.
2. A caterpillar turns into pupa.
3. A flower grows into fruit.
4. A ship moves in water.

A1 and 4 only
B1 and 3 only
C2 and 3 only
D2 and 4 only

The given graphs show the amount of different antibodies P and Q in the blood of a person during a pathogenic infection and after complete recovery.

What could be inferred from the given graphs?

A The person might have suffered from two pathogenic infections simultaneously for which his body produced antibodies P and Q.
B The person has acquired artificial active immunity for pathogen against which his body produced antibody Q.
C This time the person suffered from the pathogenic infection for which his body produced antibody Q.
D The person has acquired passive immunity for both the pathogens for which his body produced antibodies P and Q.

Which of the following stages in the life history of a silkmoth feeds on the leaves?

A

B

C

D

A soft iron nail, XY, is placed within a current carrying solenoid for a very short while as shown in figure.When the nail is removed from the solenoid, which of the following statements is true?


AEnd X will be able to repel a similar iron nail which has been magnetised.
B End X will be attracted to the North-seeking pole of a bar magnet.
C End Y will be repelled by the South-seeking pole of a bar magnet.
DEnd Y will point to the North pole of the Earth when freely-suspended.

A square transparent sheet with a pattern and a dotted line on it is given. Find a figure from the options as to how the pattern would appear when the sheet is folded along the dotted line.


A
B
C
D

Which of the following statements are correct?
(i) Changes in our surroundings that make us respond is called adaptation.
(ii) The process of getting rid of body wastes by the living organisms is known as reproduction.
(iii) Breathing is a part of a process called respiration.
(iv) Aquatic animals have streamlined bodies to help them use oxygen dissolved in water.
(v) Desert plants have leaves to reduce loss of water from the leaves through transpiration.

A(i) and (ii)
B(iii) and (v)
C(iii), (iv) and (v)
D(i), (iii) and (iv)

Refer to the given flow chart and select the correct option regarding it


AW - Hydrilla, X, Lotus
BY - Duckweed, Z - Water hyacinth
CW - Coconut, Z - Water lily
DX - Water hyacinth, Y - Wolffia