Q1: Which is the most abundant gas in the Earth's atmosphere?

Oxygen
Nitrogen
Carbon dioxide
Helium

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Q2: Which gas is known as laughing gas?

Oxygen
Nitrogen
Nitrous oxide
Carbon dioxide

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Q3: Which color deviates the most in dispersion of light?

Red
Violet
Green
Yellow

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Q4: Which gas turns lime water milky?

CO2
O2
H2
N2

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Q5: Which of these is an element?

Water
Salt
Oxygen
Sugar

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Q6: Area of a circle with radius 7 cm (use π = 22/7)?

154 cm²
147 cm²
140 cm²
160 cm²

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Q7: What is the breathing organ in fish?

Lungs
Skin
Gills
Mouth

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Q8: The value of (2/3)^2 is?

4/9
2/6
8/9
4/6

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Q9: Which organ in humans secretes bile?

Stomach
Liver
Pancreas
Intestine

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Q10: What is the frequency of DC current?

0 Hz
50 Hz
100 Hz
Infinite

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Q11: The gas evolved on adding HCl to Zn is?

Oxygen
Hydrogen
Carbon dioxide
Nitrogen

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Q12: The powerhouse of the cell is?

Nucleus
Mitochondria
Ribosome
Endoplasmic Reticulum

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Q13: Who was the first President of independent India?

Mahatma Gandhi
Jawaharlal Nehru
Dr. Rajendra Prasad
Sardar Patel

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Q14: Which acid is used in car batteries?

Nitric acid
Sulphuric acid
Hydrochloric acid
Carbonic acid

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Q15: Which blood cells transport oxygen?

WBC
RBC
Platelets
Plasma

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Q16: Respiration occurs in which organelle?

Chloroplast
Mitochondria
Nucleus
Golgi body

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Q17: Type of bond in NaCl?

Covalent
Ionic
Metallic
Hydrogen

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Q18: Which device converts chemical energy into electrical energy?

Motor
Generator
Battery
Turbine

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Q19: Which mirror is used in torch lights?

Plane
Convex
Concave
None

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Q20: Light travels fastest in?

Air
Water
Vacuum
Glass

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