1. According to the World Health Organization (WHO), health is defined as a state of complete physical, mental, and ________ well-being.
A) Financial
B) Social
C) Educational
D) Environmental
Answer: B) Social.
2. What is the standard SI unit symbol for force?
A) f
B) n
C) F
D) N
Answer: D) N.
3. Who discovered the link between electricity and magnetism?
A) Alexander Fleming
B) Hans Christian Oersted
C) Alessandro Volta
D) Edward Jenner
Answer: B) Hans Christian Oersted.
4. Friction always acts in a direction ________ to the direction of motion.
A) Parallel
B) Same
C) Opposite
D) Perpendicular
Answer: C) Opposite.
5. Pressure is defined as the ________ per unit area.
A) Mass
B) Volume
C) Force
D) Density
Answer: C) Force.
6. Nitrogen constitutes approximately what percentage of the air?
A) 21%
B) 78%
C) 0.03%
D) 0.9%
Answer: B) 78%.
7. Which gas is released when calcium oxide reacts with water to form lime water?
A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Heat energy is released (No gas)
Answer: D) Heat energy is released; the reaction forms calcium hydroxide.
8. The force resulting due to the action of muscles is known as ________ force.
A) Magnetic
B) Muscular
C) Electrostatic
D) Gravitational
Answer: B) Muscular.
9. The temperature at which a liquid boils and turns into vapour is its ________.
A) Melting point
B) Freezing point
C) Boiling point
D) Condensation point
Answer: C) Boiling point.
10. Dr. Kamal Ranadive's work highlighted how pollution and tobacco raise the risk of ________.
A) Malaria
B) Diabetes
C) Cancer
D) Cholera
Answer: C) Cancer.
Section B: Case Based Questions (2 x 4 = 8 Marks)
Case 1: A student moves to a new city and feels lonely. To cope, he spends excessive time on his phone, which leads to headaches, weight loss, and poor sleep.
Q) What were the causes of the boy's health problems and how should he improve?
The cause was loneliness combined with excessive screen time and a lack of social interaction. He should limit screen time, meet a counsellor, and try to make new friends to improve his mental and social well-being.
Case 2: Hans Christian Oersted noticed that when an electrical circuit was closed or opened, a magnetic compass needle deflected.
Q) What does this deflection indicate and how does it happen?
The deflection indicates that the electric current flowing through the wire produced a magnetic field. This magnetic field interacts with the tiny magnet inside the compass needle to cause movement.
Section C: Match the Following (4 x 1 = 4 Marks)
Match Column A (Force Type) with Column B (Example):
1. Muscular Force a) A fruit falling from a tree
2. Magnetic Force b) Lifting a school bag
3. Frictional Force c) A compass needle pointing North
4. Gravitational Force d) A ball stopping on its own
1-b, 2-c, 3-d, 4-a.
Section D: Short Answer Questions (5 x 2 = 10 Marks)
1. What are interparticle spaces in matter?
Interparticle spaces are the tiny gaps between the constituent particles of a substance. In solids, these spaces are minimum, while in gases they are maximum.
2. What is meant by balanced forces?
Balanced forces occur when multiple forces acting on an object at rest cancel each other out. This means the net effect is zero and the object remains stationary.
3. Explain why vaccines are called "preventive" but not "curative."
Vaccines train the immune system to recognize germs before an infection occurs to prevent illness. They do not treat or cure a person who is already sick with the disease.
4. Why do school bags have broad straps?
Broad straps spread the weight of the bag over a larger area of the shoulder. This reduces the pressure, making it more comfortable to carry the bag.
5. What metals are typically used in Dhokra art?
Dhokra art traditionally uses molten brass or bronze to fill hollow clay moulds. These metals give the art a shiny golden color and strength.
Section E: Long Answer Questions (2 x 4 = 8 Marks)
1. Describe the cycle of how a cyclone forms over warm ocean waters.
Warm moist air rises from the ocean, creating low pressure that causes surrounding air to rush in. As the air rises, water vapour condenses, releasing heat that warms the air further, making it rise even more. The Earth's rotation then causes this moving air to spin, creating a spinning system of clouds and rain. This repeating cycle results in a very low-pressure center called the eye with high-speed winds around it.
2. Define a pure substance and explain how it differs from a mixture in science.
A pure substance consists of only one type of particle that cannot be separated by physical processes. In contrast, a mixture contains two or more substances that retain their individual properties and do not react chemically. Components of a mixture can usually be separated using physical methods. Pure substances can be further classified as elements or compounds, whereas mixtures can be uniform or non-uniform.
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