Q1. Which one of these is not a measuring instrument?
(a) Barometer (b) Thermometer (c) Picometer (d) Hygrometer
- Picometer is the unit of Length in metric measurement system. 1 Picometer = 1 trillionth of 1 metre.
- Barometer is used to measure atmospheric pressure.
- Hygrometer is used to measure water vapour in the atmosphere.
Q2. According to Darwin the unit of Natural Selection is
(a) Individual (b) Family (c) Genus (d) Species
- Charles Darwin was an English naturalist, geologist and biologist, best known for his contributions to the science of evolution.
- One of the books written by him was titled ‘On the Origin of Species’, published on 24 November 1859. The book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. — #Wikipedia
Q3. Which one of the following plants keep its stomata open during night and closed during the day?
(a) Water Lily (b) Cactus (c) Sun flower (d) Fern
- Cactus and many agaves evolved adaptation to extreme heat and drought by keeping their stomates closed during the day so there is no moisture loss. The CAM metabolism (Crassulacean acid metabolism) allows the cactus to open stomata at night to take in carbon dioxide so all gas exchange is completed before when the sun rises. — #Link
Q4. The main function of nor epinephrine is to
(a)increase blood pressure (b)increase urine formation
(c)increase cellular respiration (d)release epinephrine
- Norepinephrine also called noradrenaline is both a hormone, produced by the adrenal glands, and a neurotransmitter, a chemical messenger which transmits signals across nerve endings in the body.
- Problems with norepinephrine levels are associated with depression, anxiety, post-traumatic stress disorder etc. Bursts of norepinephrine can lead to euphoria (very happy) feelings but are also linked to panic attacks, elevated blood pressure, and hyperactivity. — #Link
Q5. Which one of the following is not a metal?
(a) Platinum (b) Mercury (c) Nickel (d) Silicon
Q6. Which one of the following plant tissues is composed of dead cells?
(a) Xylem (b) Phloem (c) Parenchyma (d) Hypodermis
- The main functions of xylem are the transportation of water and mechanical support. It contains mostly dead cells.
- The main functions of the phloem are the transportation of sugars and mechanical support. It contains mainly living cells. — #Link
Q7. Which one of the following blood-group bearing persons is called a universal donor?
(a) A (b) B (c) AB (d) O
- Blood is made up of red blood cells, white blood cells and platelets in a liquid called plasma. Blood group is identified by antibodies and antigens present in the blood.
- Antibodies are proteins found in plasma.
- Antigens are protein molecules found on the surface of red blood cells.
- Group A –> has only the A antigen on red cells (and B antibody in the plasma).
- Group B –> has only the B antigen on red cells (and A antibody in the plasma).
- Group AB –> has both A and B antigens on red cells (but neither A nor B antibody in the plasma).
- Group O –> has neither A nor B antigens on red cells (but both A and B antibody are in the plasma). — #Link
Q8. The largest reservoir of Nitrogen on Earth is
(a) Soil (b) Air (c) Ocean (d) Rock
Air composition :
- Nitrogen –> 78%
- Oxygen –> 20.96%
- CO2 –> 0.04%
Q9. The increase in an individual’s size with changing age is termed —
(a) growth (b) development (c) maturity (d) change
Q10. Habit depends on
(a) learning (b) imitation (c) thinking (d) imagination
Q11. Oxygen was discovered by
(a) Priestley (b) Lavoisier (c) Charles (d) Boyle
- Carl Wilhelm Scheele (Swedish chemist) discovered oxygen in 1772.
- Joseph Priestley (English chemist) independently discovered oxygen in 1774.
- Antoine-Laurent Lavoisier (French chemist) interpreted the role of oxygen in respiration as well as combustion during 1775–80. — #Link
Q12. Which one of the following is in the mixture of sympathetic ink?
(a) Cobalt chloride and water (b) Zinc chloride and water
(c) Magnesium chloride and water (d) None of the above
- Cobalt chloride turns from blue to pink when exposed to water. The colour change occurs because of a hydration reaction; heat can drive off the water, causing the cobalt chloride to return to blue. — #Link
- Sympathetic ink is also known as Invisible ink.
Q13. Both ends of the tube of a Telescope have
(a) convex lens (b) concave lens (c) piano convex lens (d) piano concave lens
Q14. According to cellular structure which one of the following is most complex?
(a) Bacteria (b) Protozoa (c) Algae (d) Fungi
- The main identifying characteristic of fungi is the makeup of their cell walls. Many contain a nitrogenous substance known as “chitin,” which is not found in the cell walls of plants, but can be found in the outer shells of some crabs and mollusks. — #Link
Q15. Plants store glucose in the form of
(a) Monosaccharide (b) Cellulose (c) Starch (d) Glycogen
- A glucose chain with an oxygen and hydrogen pair pointing downward is called an “alpha glucose,” while a glucose chain with an oxygen and hydrogen pair pointing outward is called a “beta glucose.” To make starch, alpha glucose molecules combine at the oxygen-hydrogen pair, forming a curled starch molecule with many glucose molecules branching off the main molecule. When the plant needs energy, a glucose molecule is taken from the starch molecule to be broken down for the stored energy. — #Link
Q16. The amount of blood in the blood circulatory system of a man is
(a) one litre (b) two litres (c) five litres (d) ten litres
- Its nearly 4.7 to 5.5 Ltrs.
Q17. L.P.G. Cylinders contain inside
(a)Butane and Isobutane (b)Butane and Propane
(c)Isobutane and Propane (d)Butane,Isobutane and Propane
- LPG is a mixture of commercial butane and commercial propane having both saturated and unsaturated hydrocarbons. LPG marketed in India is governed by Indian Standard Code IS-4576 (Refer Table 1.0) and the test methods by IS-1448. —#Link
Q18. The process by which the gas comes out of an L.P.G. Cylinder is called
(a) Diffusion (b) Effusion (c) Pressure (d) Ventilation
Q19. Of the twenty amino acids how many are considered essential?
(a) Six (b) Eight (c) Twelve (d) Fourteen
- These essential amino acids are not synthesized by the body tissues but these must be taken in diet.
- There are 22 genetically encoded (proteinogenic) amino acids, 20 in the standard genetic code and an additional 2 that can be incorporated by special translation mechanisms. —#Link
- As per (medlineplus.gov) 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. —#Link
- As per (biology.arizona.edu) 10 essential amino acids are arginine (required for the young, but not for adults), histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. —#Link
Q20. Dentists use
(a) Special Mirror (b) Plane Mirror (c) Concave Mirror (d) Convex Mirror
- A concave mirror gives the dentist a magnified reflection of the mouth while also refracting a bit of light. This means the image in the mirror is larger, brighter, and, for the dentist, easier to see. Another plus of using a concave mirror is that the image in the mirror isn’t inverted. —#Link
Q21. Cholesterol is a/an
(a) Saturated fat (b) Unsaturated fat (c) Steroid (d) Diglyceride
- Cholesterol is the most abundant steroid in the body. —#Link
- Cholesterol is the precursor of the five major classes of steroid hormones: progestagens, glucocorticoids, mineralocorticoids, androgens, and estrogens . These hormones are powerful signal molecules that regulate a host of organismal functions. —#Link
Q22. Which one of the following animals possess least number of body segments?
(a) Flat worm (b) Earth worm (c) Prawn (d) Cockroach
- Flat worm –> unsegmented.
- Earth worm –> 100-150 segments.
- Prawn –> divided into two main parts – head & thorax.
- Cockroach –> head, thorax & abdomen.
Q23. Sweat, saliva and tear contain an enzyme called Lysozyme. It kills
(a) Virus infected cells (b) Protozoa (c) Bacteria (d) Virus
- LYSOZYME, which was described by Fleming in 1922, is an enzyme which is able to destroy not only the non-pathogenic bacteria, but also most of the organisms, pathogenic for man and the lower animals. —#Link
- Lysozyme attack of the cell walls of Gram-positive bacteria. Cell death occurs by the “lytic action”. —#Link
Q24. Antibodies are synthesized by
(a) Bone marrow (b) Plasma and Lymph (c) Liver (d) Kidney
- Antibodies are proteins produced by certain lymphocytes in response to a specific antigen. B-lymphocytes and T-lymphocytes produce the antibodies. B-lymphocytes become plasma cells which then generate antibodies. —#Link
Q25. The first hormone produced by Genetic Engineering is
(a) Estrogen (b) Testosterone (c) Thyroxin (d) Insulin
- Recombinant DNA technology was first used commercially to produce human insulin from bacteria. In 1982, genetically-engineered insulin was approved for use by diabetics. People with certain types of diabetes inject themselves daily with insulin, a protein hormone that regulates blood sugar. —#Link
Q26. X-ray fails to pass through
(a)Flesh (b) Bone (c) Iron (d) Gold
- Different parts of the body absorb the x–rays in varying degrees. Dense bone absorbs much of the radiation while soft tissue, such as muscle, fat and organs, allow more of the x–rays to pass through them. As a result, bones appear white on the x–ray, soft tissue shows up in shades of gray and air appears black. —#Link
Q27. The scientific name of Vitamin ‘C’ is
(a) Acetic acid (b) Muriatic acid
(c) Ascorbic acid (d) Lactic acid
- It is used to prevent and treat scurvy.