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Paint applied to an iron surface prevents the iron from rusting. Which ONE of the following provides the best reason?

AIt prevents nitrogen from coming in contact with the iron
BIt reacts chemically with the iron
CIt prevents carbon dioxide from coming in contact with the iron
DIt prevents oxygen and moisture from coming in contact with the iron

Which of the following researcher would be most interested in maintaining a healthy deciduous forest?

ABiochemist
BZoologist
CToxicologist
DEcologist

Mount Fuji volcano erupted few years back. It threw out fine, glass-rich ash into the atmosphere. It thereby distrupted air traffic and caused inconvenience to air travel. It might also erupt again in future. Mount Fuji is an example of

AVulnerable volcanoes
BExtinct volcanoes
CDormant volcanoes
DActive volcanoes.

An infectious disease is one that is ___________.

Acaused by all bacteria
Btransferred by mosquitoes
Cspread from person to person
Dcaused by a pathogen or its products

Cross pollination is the process of

ATransfer of pollen grains from anther of one flower to stigma of other flower on different plant of the same species.
BTransfer of pollen grains from anther of one flower to stigma of the same flower.
CTransfer of pollen grains from anther of one flower to stigma of another flower on different plant of different species.
DBoth A and C

Match the numbers (1, 2, and 3) with the letters (P, Q and R) to explain how the mammal shown below is well adapted to its environment.



P - To tear the bark of tree.
Q - Help the animal to remain cool in hot and humid climate.
R - Acts as nose and picks up the food.

A(1) - P, (2) - Q, (3) - R
B(1) - Q, (2) - P, (3) - R
C(1) - R, (2) - Q, (3) - P
D(1) - Q, (2) - R, (3) - P

Read the given statements about a human body system.
1. It consists of brain, spinal cord and nerves.
2. It controls all our actions like seeing, hearing, walking and learning.
The body system referred to in the statements is __________.

A Circulatory system
B Respiratory system
C Nervous system
D Digestive system

Two balls of different masses have the same kinetic energy. Then the

(A) Heavier ball has greater momentum than the lighter ball

(B) Lighter ball has greater momentum than the heavier ball

(C) Both balls have equal momentum

Which of these works on mechanical energy?

(A)

(B)

(C)

Which of the following is a correct match ?