# Basic Science Questions and Answers updated daily – General Knowledge

Basic Science Questions: Solved 329 Basic Science Questions and answers section with explanation for various online exam preparation, various interviews, General Knowledge Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

## Basic Science Questions

1. Hydroscope is an instrument that used to __________.

Correct Ans:sound under water
Explanation:
Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of the water by means or a series of mirrors enclosed in a steel tube.

The hydrophone is an instrument used for recording sound underwater.
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2. Bernoulli"™s theorem is applicable to _____?

Correct Ans:Energy
Explanation:
Bernoulli's principle can be derived from the principle of conservation of energy.

This states that, in a steady flow, the sum of all forms of energy in a fluid along a streamline is the same at all points on that streamline.
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3. A piece of wood is float above water then up thrust on it will be ____________.

Correct Ans:equal to the weight of the wood
Explanation:
Upthrust is the force that pushes an object up and makes it seem to lose weight in a fluid.

According to Archimedes' Principle, the upthrust on an object in a fluid is equal to the weight of the fluid displaced.

Upthrust = Weight of Fluid Displaced
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4. What is the unit of the physical quantity "Inductance"?

Correct Ans:henry
Explanation:
Henry is the unit of physical quantity Inductance. The unit is named after Joseph Henry (1797â€“1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as Michael Faraday (1791â€“1867) in England.
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5. Which of the following is not a property of heavy water?

Correct Ans:Boiling point of heavy water is lower than that or ordinary water
Explanation:
Boiling point of heavy water is higher than that or ordinary water as there is stronger hydrogen bonding in heavy water (D2O) than in ordinarywater (H2O) . That is why heavy water has a higher boiling point (101.42 degree C) than ordinary water (1oo degree C). Because of stronger hydrogen bonding, intermolecular association is also greater in heavy water than in ordinary water.
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6. Human saliva contains an enzyme called "salivary amylase" that breaks down starch to give sugar. It is present in the mouth. There is another area which uses this enzyme. Which of the following is it?

Correct Ans:Pancreas
Explanation:
Amylase is found in two main areas â€“ saliva in the mouth and pancreatic juice in the pancreas. Pancreatic juice is secreted into the small intestine where it helps continue digestion. In both areas amylase helps to break down starch into simpler sugars.

Hence, option D is correct.
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7. Which of the following is/are true about blood pressure in the human body?

I. This pressure is much greater in arteries than in veins.
II. The pressure of blood during contraction is called diastolic pressure.
III. The normal systolic pressure is about 120 mm of Hg and diastolic pressure is 80 mm of Hg.

Correct Ans:Only I and III
Explanation:
Statements I and III are correct.

Statement II is opposite of what is correct. The pressure of blood inside the artery during ventricular systole (contraction) is called systolic pressure and pressure in artery during ventricular diastole (relaxation) is called diastolic pressure.

Hence, option B is correct.
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8. Which of the following statements is/are correct?

I. In vertebrates, blood flows twice through the heart in each cycle.
II. Amphibians and many reptiles have three-chambered hearts.
III. Fishes have only two chambers to their hearts.

Correct Ans:All of the above
Explanation:
All the statements are correct.

I. The separation of the right side and the left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing. Such separation is useful in beings that have high energy needs and constantly use energy to maintain their body temperature. Ex: Mammals. Also, in vertebrates, Blood goes through the heart twice during each cycle in other vertebrates. This is known as double circulation.

II. In some animals like reptiles, the body temperature depends on the temperature in the environment. Such animals have three-chambered hearts, and tolerate some mixing of the oxygenated and de-oxygenated blood streams.

III. Fishes have only two chambers to their hearts, and the blood is pumped to the gills, is oxygenated there, and passes directly to the rest of the body. Thus, blood goes only once through the heart in the fish during one cycle of passage through the body.

Hence, option E is correct.
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9. Blood Pressure in humans is measured using the

Correct Ans:Sphygmomanometer
Explanation:
Anemometer is used to measure wind speed.

Thermometer is used to measure body temperature.

Hence, option A is correct.
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10. Which of the following is/are true about the human heart?

I. The heart has valves to ensure blood does not flow backwards when the atria or ventricles contract.
II. Oxygen-rich blood from the lungs enters the heart via the right atrium.
III. Ventricles have thicker muscular walls than the atria.

Correct Ans:Only I and III
Explanation:
Statement I is correct. Statement III is correct.

Statement II is incorrect as oxygenated blood enters the heart via the Left Atrium.

Hence, option C is correct.
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11. Which of the following is/are true about the functions of blood in human body?

I. It consists of a fluid medium called plasma which transports oxygen.
II. It contains red blood cells which transports food, carbon dioxide and nitrogenous wastes.
III. Blood makes up around 7% of the weight of a human body.

Correct Ans:Only III
Explanation:
Statement I is incorrect as the plasma transports food, carbon dioxide and nitrogenous wastes.

Statement II is incorrect as oxygen is carried by the red blood cells.

Statement III is correct.

Hence, option A is correct.
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12. When the electric impulse travels along the axon and reaches the other end called the synaptic terminal, this impulse triggers the release of ?

Correct Ans:Vesicles
Explanation:
The electrical impulses stimulate the release of vesicles. These store various neurotransmitters that are released at the synapse. Vesicles are essential for propagating nerve impulses between neurons and are constantly recreated by the cell.

Hence, option A is correct.
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13. The long, slender projection of a nerve cell that conducts electrical impulses (carrying information) away from the nerve cell body and transmits this information to different neurons, muscles, and glands is known as:

Correct Ans:Axon
Explanation:
An axon, also known as nerve fiber, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses known as action potentials, away from the nerve cell body. The function of the axon is to transmit information to different neurons, muscles, and glands.

Hence, option B is correct.
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14. The ending of a nerve cell used to acquire information from our environment is called

Correct Ans:Dendrite
Explanation:
The ending used for information gathering is called a dendrite.

Hence, option C is correct.
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15. Receptors used to detect taste are known as

Correct Ans:Gustatory receptors
Explanation:
Gustatory receptors detect taste while olfactory receptors detect smell. Nerve cell receptors detect temperature etc.

Hence, option A is correct.
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16. Pyorrhoea is a disease of the

Correct Ans:Gums
Explanation:
Pyorrhoea (gum diseases) is set of inflammatory disease affecting the periodontium i.e., the tissues that surround and support the teeth.
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17. How many millimeters make ten kilometers?

Correct Ans:107
Explanation:
1 cm = 10 mm
1 m = 100 cm = 1,000 mm
1 km = 1,000 m = 1,000,000 mm
10 km = 10,000,000 mm = 107
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18. Which one of the following substances is used in the preservation of food stuff?

Correct Ans:Sodium Benzoate
Explanation:
Sodium benzoate is a substance which has the chemical formula C6H5COONa and it is a widely used food preservative.
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19. Optical fibre works on the principle of

Correct Ans:Total internal reflection
Explanation:
An optical fiber is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. They work on the principle of total internal reflection.
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20. The term LASER stands for

Correct Ans:Light Amplification by Stimulated Emission of Radiation
Explanation:
LASER stands for Light Amplification by Stimulated Emission of Radiation.
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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