Subjectwise MCQ
Statewise Prepration
Govt. Examwise MCQ
320 Science MCQ Questions in english हिन्दी
Read science multiple choice questions for the various types of competitive exams. These science questions will help students to prepare for their exams. Improve your Science subject knowledge by reading these science questions.
Which hormone regulates blood sugar levels?
Insulin, produced by the pancreas, helps regulate glucose levels in the blood by facilitating its uptake into cells.
What is the speed of light in a vacuum?
Light travels at approximately 300,000,000 meters per second in a vacuum—the universal speed limit.
Which instrument is used to measure atmospheric pressure?
A barometer measures atmospheric pressure and is essential in weather forecasting and aviation.
In which form is energy stored in the human body?
The body stores energy in the form of glycogen, a polysaccharide that breaks down into glucose when needed.
What is the chemical formula of common salt?
Common salt is sodium chloride (NaCl), essential for human health and widely used in food preservation.
Which organ in the human body is known as the “filter”?
Kidneys filter waste from the blood and regulate water and salt balance, playing a crucial role in homeostasis.
What causes day and night on Earth?
The Earth rotates on its axis, resulting in the alternation of daylight and darkness every 24 hours.
Which gas is most abundant in Earth's atmosphere?
Nitrogen makes up about 78% of Earth’s atmosphere and is vital for plant growth through the nitrogen cycle.
Which part of the plant conducts photosynthesis?
Leaves contain chlorophyll, which captures sunlight to convert carbon dioxide and water into glucose and oxygen.
What type of energy is stored in a stretched rubber band?
When a rubber band is stretched, it stores potential energy, which is converted to kinetic energy when released.
Which vitamin is known as the "sunshine vitamin"?
Vitamin D is synthesized in the skin through sunlight exposure and is essential for calcium absorption and bone health.
What is the SI unit of electric current?
Ampere is the SI unit for measuring electric current and is named after André-Marie Ampère, a pioneer in electromagnetism.
Which element is most abundant in the human body?
Oxygen is the most abundant element by mass in the human body as it is a major component of water and bodily fluids.
Which nuclear research center is located in Uttar Pradesh?
Narora Atomic Power Station is situated in Bulandshahr district of UP and plays a crucial role in India's nuclear energy generation.
Which part of the plant absorbs water and minerals from the soil?
Roots contain tiny hairs that absorb water and nutrients.
What is the main component of natural gas?
Natural gas is primarily composed of methane (CH₄), a clean-burning fuel.
Which device is used to detect earthquakes?
Seismographs record the intensity and duration of tremors.
Which method is used to separate salt from seawater?
Distillation separates salt and water based on boiling points.
Which disease affects the respiratory system?
Asthma causes narrowing of the airways, making breathing difficult.
What is the function of red blood cells (RBCs)?
RBCs contain hemoglobin that binds oxygen.
Which hormone is known as the ‘stress hormone’?
Adrenaline increases heart rate and energy during stress.
Which acid is present in vinegar?
Acetic acid gives vinegar its sour taste and smell.
The chemical formula of lime water is:
Lime water is calcium hydroxide used in tests for CO₂.
Which disease is caused by a protozoa?
Malaria is caused by Plasmodium, spread by Anopheles mosquitoes.
Which gland is called the “master gland”?
The pituitary gland controls many other endocrine glands.
Which part of the ear helps maintain body balance?
Semicircular canals in the inner ear detect motion and balance.
Which gas is most abundant in the atmosphere?
Nitrogen makes up ~78% of the Earth's atmosphere.
The process by which plants lose water is called:
Transpiration occurs mainly through leaf stomata.