Q1. Hydrogen bomb is based on the principle of

(A) Nuclear fission (B) Nuclear fusion
(C) Nuclear explosion.. (D) None of the above

Atoms release energy in 2 ways :-

  1. Fission (Splitting) –> Gets split into smaller atoms & produce heat.
  2. Fusion (Joining) –> Small atoms (hydrogen isotopes) smash together, combine, and release energy.
  • All of the world’s nuclear power stations currently work by fission, but scientists hope to build fusion stations.
  • Most of the atomic weapons use fission, which needs pure  Uranium & Plutonium, so their chain reactions continue over & over.
  • Hydrogen bombs are even more powerful & work through nuclear fusion.
  • Solar Energy is also due to Nuclear fusion reaction.

Q2. Solar energy is due to

(A) Nuclear fusion reaction (B) Chemical reaction
(C) Nuclear fission reaction (D) Burning of H

  • Two heavier isotopes of hydrogen (deuterium & tritium) smash together to make helium. A spare neutron is fired out and heat energy is released.

Q3. Pitcher plant is

(A) Autotrophic (B) Heterotrophic
(C) Insectivorous (D) Actinomorphic

  • Pitcher plant is a type of Carnivorous plants. Insectivorous plants derive their nutrition by feeding on insects and other organisms. They are basically found in nitrogen deficient soil.
  • Autotrophs are capable of synthesizing own food from inorganic substances using light & chemical energy. Eg. Green plants.
  • A heterotroph is an organism that eats other plants or animals for energy and nutrients. The term stems from the Greek words hetero for “other” and troph for “nourishment.” All animals fit into this category. — #Link
  • The actinomorphic plants are radially symmetrical that is these can be bisected into two same halves in more than one plane whereas, the zygomorphic plants have bilaterally symmetrical flowers that is these flowers can be bisected into two halves in only one plane. Example of actinomorphic flowers includes Gulmohor and the example of zygomorphic flowers include Mustard. — #Link

Q4. AIDS is

(A) Viral disease (B) Fungal disease
(C) Bacterial disease (D) Ganetical disease

  • The full form of AIDS is Acquired Immune Deficiency Syndrome. AIDS is a disease caused by Human Immunodeficiency Virus.

Q5. Which one of the following is a correct statement?

(A) A mineral cannot be an ore.      (B) An ore cannot be a mineral.
(C) All ores are minerals.         (D) All minerals are ores.

  • All ores are minerals while all minerals are not ores as some of them might have a large amount of unwanted substances such as sand, stones and earthly impurities. For example: Aluminium occurs in earth’s crust in the form of two minerals bauxite and clay. Out of these, aluminium can be easily and profitably extracted from bauxite only. So, we can infer that bauxite is an ore of aluminium.On the other hand, it has not been possible to obtain aluminium from clay by some easy and cheap method. So, clay remains only as mineral and not as ore of aluminium. — #Link

Q6. Universal donor in blood transfusion refers to

(A) Blood Group A (B) Blood Group B
(C) Blood Group AB (D) Blood Group O

  • O- blood group is related to universal donor because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group.
  • Blood group AB is called Universal Receptor because it does not contain any Antibody.

Q7. Scurvy is caused by the deficiency of

(A) Vit. A (B) Vit. B
(C) Vit. C (D) Vit. D

  • Vitamin C is also called Ascorbic Acid, found in vegetables, especially citrus fruits.

Q8. Viscosity of a liquid

(A) Increases with increase in temperature
(B) Decreases with increase in temperature
(C) Independent of temperature
(D) Decreases with increase in pressure

  • It is the property of a substance by virtue of which it opposes the relative motion between its adjacent layers.
  • This property can be seen both liquid and gases. Viscosity of the gas increases with the increase of temperature.

Q9. Which of the following becomes zero in a fully turgid cell?

(A) Water potential (B) Wall pressure
(C) Osmotic pressure (D) All of the above

  • When a plant cell is placed in a hypotonic solution (has a lower concentration of solutes than another solution), it takes up water by osmosis & starts to swell, but the cell wall prevents it from bursting. The plant cell is said to have become ‘turgid’ or hard. The internal pressure (cell’s inside) rises until it becomes equal to the outside pressure.
  • In a fully turgid cell Suction Pressure, Water Potential and Diffusion Pressure Deficit (DPD) become zero.

Q10. If density of air is 1.30 g/lit. what is the volume occupied by 7.8g of air?

(A) 10 lit. (B) 6lit.
(C) 6.5 lit. (D) 10/10 lit

  • Density = Mass/Volume

Q11. Colles’ fracture is associated with
(A) Humerus (B) Radius (C) Ulna (D) Femur

  • A type of fracture of the distal forearm in which the broken end of the radius is bent backwards.
  • Largest bone of Human body is Femur (Thigh Bone), Smallest bone is Stapes (Ear bone – innermost bone of our auditory ossicles in the middle ear).
  • Humerus — a long bone in the arm that runs from the shoulder to the elbow.
  • Radius — is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The ulna is usually slightly longer than the radius, but the radius is thicker. — WIkipedia
  • Adult human has 206 bones. And averagely 300 bones are there in babies.

Q12. Septicemia is

(A) Food poisoning (B) Blood poisoning
(C) Mental disorder (D) None of the above

  • Botulism –> Food poisoning.

Q13. The purest from of iron is

(A) Wrought iron (B) Cast iron
(C) Iron turning (D) Stainless steel

  • Wrought iron is an iron alloy with a low carbon content in contrast to cast iron.
  • Stainless Steel is an metal alloy made up with steel mixed with elements such as chromium, nickel molybdenum, silicon, aluminium & carbon.

Q14. Malaria is caused by

(A) Plasmodium (B) Anopheles mosquito

(C) Cuiex mosquito (D) Bad air

  • Malaria is caused by a protozoan Plasmodium species & its transmitting agent (carrier) is female Anopheles mosquito.
  • Different types of Plasmodium species (P. vivax, P. malariae, P. falciparum) are responsible for different types of malaria.

Q15. Which one will you use to correct myopic vision ?

(A) Sphero-cylindrical lens
(B) Concave lens of suitable focal length
(C) Convex lens of proper power
(D) Convex spectacle lens of suitable focal length

  • Shortsightedness is corrected using a concave (curved inwards) lens which is placed in front of a myopic eye, moving the image back to the retina and making it clearer.
  • Longsightedness is corrected using a convex (outward facing) lens. This is placed in front of a hypermetropic eye, moving the image forward and focusing it correctly on the retina. — #Link

Q16. Which one of the following is the weakest force?

(A) Gravitational Force (B) Electromagnetic force

(C) Nuclear force (D) Electrostatic force

  • The gravitational attraction between two electrons is only 8.22* [10^ (-37)[ of the electrostatic force of repulsion at the same separation.

Q17. What is increased in the stepdown transformer?

(A) Voltage (B) Current (C) Wattage (D) Current density

  • In a stepdown transformer the secondary voltage is less than its primary voltage. It reduces the voltage from the primary winding to the secondary winding. It is designed to convert high-voltage low current power into a low-voltage high current power & it is mainly used in domestic consumption. Eg. doorbells works in 10 to 24 volts, but the house circuit is of 240 volts.
  • In a stepup transformer low-voltage high power current converted into high-voltage low power current; mainly used in power plants.

Q18. The genetic informations are carried by

(A) Protein (B) Fatty acids
(C) Nucleic acids (D) Carbohydrate

  • Nucleic acids are the main information-carrying molecules of the cell, and, by directing the process of protein synthesis, they determine the inherited characteristics of every living thing. The two main classes of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) — #Link

Q19. When water cools from 7°C to 1°C —

(A) It contracts only
(B) It expands only
(C) It first contracts and then expands
(D) It first expands and then contracts

  • When liquid water is cooled, it contracts until a temperature of approximately 4°C is reached. After that, it expands slightly until it reaches the freezing point. — #Link
  • The density of water is maximum at 4°C

Q20. Blue colour of the sky is due to

(A) Reflection (B) Refraction (C) Scattering (D) Dispersal

  • Blue light is scattered more than other colours because it travels as shorter, smaller waves.
  • Tyndall effect is also the phenomenon of scattering of light by colloidal particles.
  • Red colour of sun at sunrise and sunset is also example of scattering.

Q21. Which of the following is the hardest substance in the human body?

(A) Bone (B) Enamel (C) Dentine (D) Nail

  • Enamel is one of the major tissues that make up the tooth in humans.

Q22. The following animal has the similar vision as we have
(A) Crow (B) Owl (C) Horse (D) Pigeon

  • Forward facing eyes; 3D vision as humans.

Q23. The following animal is called friend of farmer:

(A) Cow (B) Earthworm (C) Rhizobium (D) Honey-bee

  • Earthworms offer many benefits: increased nutrient availability, better drainage, and a more stable soil structure. — #Link

Q24. Weight of a man is more

(A) On the equator (B) At poles
(C) At the centre of the earth (D) In space

  • w = mg.
  • At centre of the earth g=0, weight of body is zero there.
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