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NJASK
Science
Grade – 8
Sample Item 1
Which of the following signs can not be evidence of a chemical change?
A.
Evolution of gas bubbles with the formation of a new substance.
B.
Change in the color of the substance with the formation of a substance that has different
properties.
Sol.
C.
Change in the physical state of the substance without the formation of a new substance
D.
Evolution of energy in the form of light, heat or electricity
The change in which physical state of a substance changes without the formation of a new substance
is known as physical change.
Answer: C
Sample Item 2
Which of the following statements is true about mixtures?
A. They can be physically separated into their components.
B. Components present in them are combined chemically.
C. Mixtures can be called pure substances.
D. There is only one type of mixtures.
Sol.
Mixtures can be separated into their components by several methods based on the properties of the
components.
Answer: A
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Sample Item 3
The arrangement of particles in the three states of matter that are obtained during phase change is shown
below:
B
A
C
Which of the following statements is true about the above states of matter?
A. Motion of particles is the maximum in state B of matter.
B. Motion of particles is the minimum in state B of matter.
C. Motion of particles is the maximum in state C of matter.
D. Motion of particles is the minimum in state C of matter.
Sol.
States A, B and C represent the solid, liquid and gaseous states of matter. Motion of particles is
minimum in the solid state and maximum in the gaseous state of matter. Hence, motion of particles is
the maximum in state C of matter.
Answer: C
Sample Item 4
Hydrogen reacts with oxygen to form water. Which of the given chemical equations represents the
process of formation of water?
Sol.
A. H2 + O2 J
H2O
B. H2 + O2 J
2H2O
C. 2H2 + O2 J
2H2O
D. 2H2 +2O2 J
2H2O
This equation is correct in accordance with the law of conservation of mass.
Answer: C
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Sample Item 5
Y
X
Life cycle of a butterfly
The above given diagram represents the life cycle of a butterfly. Which of the following two stages are
represented by the points marked X and Y respectively in the above figure?
A. egg and pupa
B. larva and egg
C. larva and pupa
D. pupa and larva
Sol.
The points marked ‘X’ and ‘Y’ in the above figure represents the larva and pupa stage respectively.
Answer: C
Sample Item 6
Which of the following organ systems include the heart as one of their components?
A. Circulatory system
B. Digestive system
C. Excretory system
D. Nervous system
Sol.
The circulatory system includes the heart, blood and the blood vessels. Answer: A
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Sample Item 7
Which of the following characteristics is an acquired characteristic?
A. height of a plant
B. eye color
C. athletic ability
D. stripes on a tiger’s body
Sol.
Athletic ability is an acquired characteristic; it is not a trait that is passed on to an individual from the
parents or ancestors. Answer: C
Sample Item 8
1
.
3
2
4
The nucleus is the command center of a cell. In the above diagram, the nucleus is represented by the
structure numbered
A. 1
B. 2
C. 3
D. 4
Sol.
The nucleus is labeled ‘3’ in the diagram given above. Answer: C
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Sample Item 9
Which of the following phenomena is caused due to rotation of the Earth on its axis?
A. Day and night
B. Seasons
C. Tides
D. Lunar eclipse
Sol.
The rotation of the Earth on its axis results in the occurrence of day and night.
Answer: A
Sample Item 10
There are some places on the Earth that are very cold. During winters, the lake water in these places
freezes whereas it gets so hot in the summers that the water level of the lake decreases. The decrease
in the water level is due to evaporation
Write the three states of water involved in the above scenario.
Answer: _________________________________________
_________________________________________________
Compare the motion of particles in the above mentioned three states of water.
Answer: _________________________________________
_________________________________________________
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