161.
Which of the following is the SI unit of temperature?
A
Joule
B
Kelvin
C
Celsius
D
Fahrenheit
View Answer
Correct Answer: B — Kelvin
Explanation:
Kelvin (K) is the SI unit of temperature.
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Which of the following is the SI unit of temperature?
Joule
Kelvin
Celsius
Fahrenheit
Correct Answer: B — Kelvin
Explanation:
Kelvin (K) is the SI unit of temperature.
Which organ is responsible for pumping blood in humans?
Brain
Stomach
Heart
Liver
Correct Answer: C — Heart
Explanation:
The heart pumps blood throughout the body.
What is the chemical formula of water?
CO₂
O₂
H₂O
H₂O₂
Correct Answer: C — H₂O
Explanation:
Water has the chemical formula H₂O, consisting of two hydrogen atoms and one oxygen atom.
What is the approximate speed of sound in air at room temperature?
400 m/s
343 m/s
330 m/s
220 m/s
Correct Answer: B — 343 m/s
Explanation:
The speed of sound in air at room temperature is approximately 343 m/s.
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
200 kJ
400 kJ
100 kJ
300 kJ
Correct Answer: A — 200 kJ
Explanation:
Kinetic energy = 1/2 mv² = 1/2 × 1000 × 20² = 200000 J = 200 kJ.
Who formulated the law of universal gravitation?
Albert Einstein
Galileo Galilei
Isaac Newton
Johannes Kepler
Correct Answer: C — Isaac Newton
Explanation:
Isaac Newton formulated the law of universal gravitation.
Which of the following is the correct formula for velocity?
v = u + at
v = u - at
v = u × at
v = u + a/t
Correct Answer: A — v = u + at
Explanation:
The equation v = u + at gives the final velocity for uniformly accelerated motion.
What is the SI unit of speed?
Kilometer
Meter per second
Second
Meter
Correct Answer: B — Meter per second
Explanation:
The SI unit of speed is meter per second (m/s).
What is the formula of sodium chloride?
Na₂Cl
NaCl₂
NaCl
Na₂Cl₂
Correct Answer: C — NaCl
Explanation:
Sodium chloride has the chemical formula NaCl.
Which subatomic particle has a negative charge?
Neutron
Electron
Proton
Both proton and electron
Correct Answer: B — Electron
Explanation:
Electrons carry a negative charge.
What is sublimation?
Solid to gas
Gas to solid
Liquid to solid
Liquid to gas
Correct Answer: A — Solid to gas
Explanation:
Sublimation is the direct change of a substance from solid to gas.
Which state of matter has no definite shape but a definite volume?
Solid
Liquid
Gas
Plasma
Correct Answer: B — Liquid
Explanation:
Liquids have a definite volume but take the shape of their container.
What is the basic unit of matter?
Proton
Molecule
Atom
Neutron
Correct Answer: C — Atom
Explanation:
The atom is the basic unit of matter.
What is matter?
Anything that has mass and occupies space
Anything that can be touched
Only solids that occupy space
Only gases with mass
Correct Answer: A — Anything that has mass and occupies space
Explanation:
Matter is anything that has mass and occupies space.
Which of the following is a dead tissue?
Parenchyma
Sclerenchyma
Collenchyma
Phloem
Correct Answer: B — Sclerenchyma
Explanation:
Sclerenchyma consists of dead cells with thick lignified walls that provide support.
Which of the following is not a simple permanent tissue?
Xylem
Parenchyma
Collenchyma
Sclerenchyma
Correct Answer: A — Xylem
Explanation:
Xylem is a complex permanent tissue made up of different types of cells.
Which of the following is a characteristic of meristematic tissue?
Thick secondary walls
Large vacuoles
Actively dividing cells
Dead cells
Correct Answer: C — Actively dividing cells
Explanation:
Meristematic tissues contain actively dividing cells responsible for plant growth.
What is the primary function of the Golgi apparatus?
Cellular respiration
Photosynthesis
Protein synthesis
Packaging and transport of materials
Correct Answer: D — Packaging and transport of materials
Explanation:
The Golgi apparatus modifies, packages, and transports proteins and lipids.
Which of the following is found only in animal cells?
Cell wall
Centrioles
Large central vacuole
Chloroplasts
Correct Answer: B — Centrioles
Explanation:
Centrioles are present in animal cells and help in cell division.
What are chromatin fibers made of?
DNA and proteins
RNA and proteins
Lipids and carbohydrates
DNA and lipids
Correct Answer: A — DNA and proteins
Explanation:
Chromatin consists of DNA wrapped around proteins called histones.