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MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Nylon is the synthetic Fibres. Nylon is the composition of which of the following chemicals? |
| A. | Amino acid and sulphuric acid |
| B. | Hydrogen and sulphur |
| C. | Carbon monoxide and hydrochloride |
| D. | Hexanedioyl dichloride and diaminohexane |
| Answer» E. | |
| 302. |
Which of the following maintains balance of water on the earth? |
| A. | Water table |
| B. | Glaciers |
| C. | Aquifer |
| D. | Water cycle |
| Answer» E. | |
| 303. |
____instrument is used to find the direction of wind at a place. |
| A. | Anemometer |
| B. | Hygrometer |
| C. | Thermometer |
| D. | Wind Vane |
| E. | None of these |
| Answer» E. None of these | |
| 304. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Heart is an organ which beats continuously to act as a pump for transport of blood, which carries other substances. The heart is located in the chest cavity with its lower tip slightly tilted towards the left. Your heart is roughly the size of your fist. To avoid the mixing of blood rich in oxygen and the blood rich in carbon dioxide, the heart has |
| A. | two atria |
| B. | two ventricles |
| C. | four chambers |
| D. | none of these |
| Answer» D. none of these | |
| 305. |
If a body covers equal distances in equal interval of time, the body is said to be in.......... |
| A. | Uniform acceleration |
| B. | Non uniform acceleration |
| C. | Uniform motion |
| D. | Non uniform motion |
| E. | None of these |
| Answer» D. Non uniform motion | |
| 306. |
The process by which the oxygenated blood moves from left auride to left ventricle and then through aorta to all parts of the body is known as |
| A. | Extracellular circulation |
| B. | Pulmonary circulation |
| C. | Systemic circulation |
| D. | Intracellular circulation |
| Answer» E. | |
| 307. |
Which of these is a behavioural adaptation? |
| A. | A hognose snake pretends as dead to trick the predator. |
| B. | A frog's light coloured belly makes it harder for a predatory fish to see it against sunlight on the water surface. |
| C. | The scarlet king snake looks very much like the poisonous coral snake. |
| D. | A treehopper on a leaf or twig resembles a thorn. |
| Answer» B. A frog's light coloured belly makes it harder for a predatory fish to see it against sunlight on the water surface. | |
| 308. |
Which of the following are removed by use of A skimmer in WWTP? |
| A. | Oils |
| B. | Greases |
| C. | Both of these |
| D. | None of these |
| Answer» D. None of these | |
| 309. |
The upper limit of water under the ground is called _________ |
| A. | ground table |
| B. | water table |
| C. | acquifer |
| D. | None of these |
| Answer» C. acquifer | |
| 310. |
A force of 20 Newton s is pushing an object 5 Meters in the direction of the force. How much work is done? |
| A. | 4 J |
| B. | 25 J |
| C. | 15 J |
| D. | 100 J |
| Answer» E. | |
| 311. |
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Study the following chart and Identify 'A' and 'B'. A B |
| A. | Sodium hydroxide Sodium chloride |
| B. | Hydrochloric acid Sodium hydroxide |
| C. | Sodium hydroxide acid Aluminum hydroxide |
| D. | Hydrochloric acid Sodium chloride |
| Answer» C. Sodium hydroxide acid Aluminum hydroxide | |
| 312. |
DIRECTIONS: Read the passages given below and answer the questions that follow. Passage - 2 Camouflage is a kind of adaptation in which an organism deceives others by merging its color with that of its surroundings. Which of the following animals camouflage? |
| A. | Siberian crane |
| B. | Red eyed frog |
| C. | Tigers |
| D. | Elephants |
| Answer» D. Elephants | |
| 313. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 3 The climatic conditions in rainforests are highly suitable for supporting an enormous number and variety of animals. Since the numbers are large, there is an intense competition for food and shelter. Many animals are, adapted for living on trees. Tropical rainforests are found in |
| A. | Central America |
| B. | Central Africa |
| C. | South-east Asia |
| D. | All of these |
| Answer» E. | |
| 314. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Two objects, a chalk box of mass 0.5 kg and a ball of mass 0.8 kg are placed at same height h as shown in figure. Then the potential energy is |
| A. | greater for chalk box |
| B. | greater for ball |
| C. | same for both chalk box and ball |
| D. | cannot say |
| Answer» C. same for both chalk box and ball | |
| 315. |
Water stored in a dam possess |
| A. | no energy |
| B. | electrical energy |
| C. | potential energy |
| D. | kinetic energy |
| Answer» D. kinetic energy | |
| 316. |
It is a part of our circulatory system and is situated in our chest cavity. It is |
| A. | blood |
| B. | heart |
| C. | kidney |
| D. | none of these |
| Answer» C. kidney | |
| 317. |
The organic part of solid material which is removed from sewage includes |
| A. | Animal excreta |
| B. | Vegetable matter |
| C. | Human excreta |
| D. | All of these |
| Answer» C. Human excreta | |
| 318. |
Mesoglea is present in- |
| A. | Sponges |
| B. | Hydra |
| C. | Spirogyra |
| D. | Vaucheria |
| Answer» C. Spirogyra | |
| 319. |
In the physics lab, Merriam rotates Newton's colour dice rapidly. A boy is observing the experiment. What he has observed in this experiment? |
| A. | Seven colours of light looks like two colours of white and black |
| B. | Seven colours of light looks like single colour of black |
| C. | Seven colours of light looks like single colour of white |
| D. | All of these |
| E. | None of these |
| Answer» D. All of these | |
| 320. |
Kinetic energy possessed by a body of mass 3 kg moving at speed of3m/sec is |
| A. | 13.6 J |
| B. | 27 J |
| C. | 4.5 J |
| D. | 54 J |
| Answer» B. 27 J | |
| 321. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 An organism X having breathing organs A lives on land. When X goes under water it cannot survive long. On the other hand organism Y with breathing organs B always lives in water and if taken out of water dies after a short time. What could organism X be? Name its breathing organ A. |
| A. | man, lungs |
| B. | fish, gills |
| C. | man, skin |
| D. | frog, lungs |
| Answer» B. fish, gills | |
| 322. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 We obtain energy by aerobic respiration. But anaerobic respiration can sometimes take place in our muscles during vigorous physical exercise when oxygen gets used up faster in the muscle cells than can be supplied by the blood. Which of the following activity can give relief from cramps? |
| A. | hot water bath |
| B. | massage |
| C. | Both (a) and (b) |
| D. | Sleep |
| Answer» D. Sleep | |
| 323. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Fig. Model to show mechanism of breathing. The figure shows a plastic bottle whose bottom has been removed. A tube has been passed by making a hole in its lid. To the forked ends of this tube are attached two deflated balloons. The bottle is sealed in such a way that it becomes air-tight. What do we inhale? |
| A. | Oxygen |
| B. | Carbon dioxide |
| C. | A mixture of gases |
| D. | None of these |
| Answer» D. None of these | |
| 324. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Fig. Model to show mechanism of breathing. The figure shows a plastic bottle whose bottom has been removed. A tube has been passed by making a hole in its lid. To the forked ends of this tube are attached two deflated balloons. The bottle is sealed in such a way that it becomes air-tight. During breathing |
| A. | there is no change in chest cavity |
| B. | there is no change in the composition of gases inhaled and exhaled |
| C. | breathing is a continuous process |
| D. | all the above are correct |
| Answer» D. all the above are correct | |
| 325. |
DIRECTIONS: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Cutaneous (i) amoeba (B) Tracheal (ii) frog (C) Diffusion (iii) cockroach (D) Pulmonary (iv) elephant |
| A. | (A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (r) |
| B. | (A) \[\to \] (q), (B) \[\to \] (r), (C) \[\to \] (p), (D) \[\to \] (s) |
| C. | (A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (r) |
| D. | (A) \[\to \] (r), (B) \[\to \] (p, q), (C) \[\to \] (p), (D) \[\to \] (s) |
| Answer» C. (A) \[\to \] (q), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (r) | |
| 326. |
The function of hair follicles inside the nose is to |
| A. | to moisten the air |
| B. | to control the amount of air being inhaled |
| C. | to detect the presence of oxygen |
| D. | to trap germs and dust particles in air. |
| Answer» E. | |
| 327. |
DIRECTIONS: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Earth worm (i) Pulmonary (B) Human (ii) Bronchial (C) Prawn (iii) Tracheal (D) Insects (iv) coetaneous |
| A. | (A) \[\to \] (i), (B) \[\to \] (ii), (C) \[\to \] (iii), (D) \[\to \] (iv) |
| B. | (A) \[\to \] (iv), (B) \[\to \] (i), (C) \[\to \] (ii), (D) \[\to \] (iii) |
| C. | (A) \[\to \] (iii), (B) \[\to \] (ii), (C) \[\to \] (iv), (D) \[\to \] (i) |
| D. | (A) \[\to \] (iv), (B) \[\to \] (ii), (C) \[\to \] (i), (D) \[\to \] (iii) |
| Answer» C. (A) \[\to \] (iii), (B) \[\to \] (ii), (C) \[\to \] (iv), (D) \[\to \] (i) | |
| 328. |
DIRECTIONS: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Cellular respiration (i) The process of breakdown of food in the cell with release of energy (B) Aerobic respiration (ii) Anaerobe. (C) Anaerobic respiration (iii) The process of breakdown of glucose with use of oxygen. (D) Yeast (iv) the process of breakdown of glucose without use of oxygen |
| A. | (A) \[\to \] (i), (B) \[\to \] (ii), (C) \[\to \] (iii), (D) \[\to \] (iv) |
| B. | (A) \[\to \] (ii), (B) \[\to \] (i), (C) \[\to \] (iii), (D) \[\to \] (iv) |
| C. | (A) \[\to \] (i), (B) \[\to \] (iii), (C) \[\to \] (iv), (D) \[\to \] (ii) |
| D. | (A) \[\to \] (i), (B) \[\to \] (iv), (C) \[\to \] (ii), (D) \[\to \] (iii) |
| Answer» D. (A) \[\to \] (i), (B) \[\to \] (iv), (C) \[\to \] (ii), (D) \[\to \] (iii) | |
| 329. |
An organism that can breathe through skin is |
| A. | frog |
| B. | fish |
| C. | earthworm |
| D. | Both (a) and (c) |
| Answer» E. | |
| 330. |
DIRECTIONS: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Yeast (i) Earthworm (B) Diaphragm (ii) Alcohol (C) Skin (iii) Chest cavity (D) Fish (iv) gills |
| A. | (A) \[\to \] (i), (B) \[\to \] (ii), (C) \[\to \] (iii), (D) \[\to \] (iv) |
| B. | (A) \[\to \] (ii), (B) \[\to \] (iii), (C) \[\to \] (i), (D) \[\to \] (iv) |
| C. | (A) \[\to \] (iii), (B) \[\to \] (iv), (C) \[\to \] (i), (D) \[\to \] (ii) |
| D. | (A) \[\to \] (iv), (B) \[\to \] (i), (C) \[\to \] (ii), (D) \[\to \] (iii) |
| Answer» C. (A) \[\to \] (iii), (B) \[\to \] (iv), (C) \[\to \] (i), (D) \[\to \] (ii) | |
| 331. |
In anaerobic respiration, pyruvic acid in muscles form |
| A. | alcohol |
| B. | glucose |
| C. | lactic acid |
| D. | none of these |
| Answer» D. none of these | |
| 332. |
Roots respire through |
| A. | lenticels |
| B. | stomata |
| C. | spiracles |
| D. | Air spaces |
| Answer» E. | |
| 333. |
What will happen to lime water when we exhale air into it? |
| A. | remains same |
| B. | turns milky |
| C. | becomes colorless |
| D. | turns blue |
| Answer» C. becomes colorless | |
| 334. |
Whales and dolphins often come up to water surface to |
| A. | swim |
| B. | breathe |
| C. | Catch food |
| D. | get sunlight |
| Answer» C. Catch food | |
| 335. |
The short tube leading from the nose is |
| A. | trachea |
| B. | alveoli |
| C. | bronchi |
| D. | pharynx |
| Answer» E. | |
| 336. |
Which of these have lungs? |
| A. | starfish |
| B. | earthworm |
| C. | rabbit |
| D. | cockroach |
| Answer» C. rabbit | |
| 337. |
In unicellular organisms oxygen is |
| A. | absorbed through lungs |
| B. | absorbed through alveoli |
| C. | diffused into cell |
| D. | absorbed by spiracles |
| Answer» D. absorbed by spiracles | |
| 338. |
In cockroach, the tracheal system opens in the outside through |
| A. | mouth |
| B. | anus |
| C. | stigmata |
| D. | pores |
| Answer» C. stigmata | |
| 339. |
In cockroaches, air enters through ______. |
| A. | gills |
| B. | trachea |
| C. | skin |
| D. | spiracles |
| Answer» E. | |
| 340. |
In humans, which of the following structures is analogous to spiracles of cockroach? |
| A. | Lungs |
| B. | alveoli |
| C. | nostrils |
| D. | Bronchioles |
| Answer» D. Bronchioles | |
| 341. |
Lenticels are found in |
| A. | the root |
| B. | the stem |
| C. | Both stem and root |
| D. | none of these |
| Answer» C. Both stem and root | |
| 342. |
The number of ATP released during anaerobic respiration is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 343. |
Why does a hot water bath or massage gives relief from cramps? |
| A. | it increases the circulation of blood |
| B. | it increases the supply of oxygen t muscles |
| C. | it results in complete breakdown of lactic acid. |
| D. | all the above are correct |
| Answer» E. | |
| 344. |
Tracheae are |
| A. | A network of air tubes in insects for exchange of gases |
| B. | small openings on the body of insects |
| C. | both the above are correct |
| D. | none of these is correct |
| Answer» B. small openings on the body of insects | |
| 345. |
Spiracles are |
| A. | the air tubes of insects |
| B. | the breathing part of frogs. |
| C. | the openings on plant leaves |
| D. | none of these |
| Answer» E. | |
| 346. |
Ribs are |
| A. | A part of the human respiratory system |
| B. | Skeletal structures surrounding the chest cavity |
| C. | Muscular floor of chest cavity |
| D. | none of these |
| Answer» C. Muscular floor of chest cavity | |
| 347. |
In it are present lungs. It is surrounded on its sides by ribs and diaphragm forms its floor. It is |
| A. | chest cavity |
| B. | windpipe |
| C. | both the above |
| D. | none of these |
| Answer» B. windpipe | |
| 348. |
An organism that can breathe both through skin and lungs is |
| A. | dog |
| B. | fish |
| C. | frog |
| D. | earthworm |
| Answer» D. earthworm | |
| 349. |
During increased physical activity |
| A. | the rate of breathing increases and becomes up to 25 breaths per minute |
| B. | the rate of breathing decreases and becomes up to 25 breaths per minute |
| C. | the rate of breath remains unchanged and is the same as that at the time of rest |
| D. | none of these |
| Answer» B. the rate of breathing decreases and becomes up to 25 breaths per minute | |
| 350. |
Choose the correct order for travel of air through various organs or respiratory system. |
| A. | Nostrils\[\xrightarrow{{}}\]larynx \[\xrightarrow{{}}\]trachea |
| B. | Nostroils\[\xrightarrow{{}}\] trachea\[\xrightarrow{{}}\]larynx |
| C. | Nostrils\[\xrightarrow{{}}\]larynx\[\xrightarrow{{}}\]lungs |
| D. | None of these |
| Answer» B. Nostroils\[\xrightarrow{{}}\] trachea\[\xrightarrow{{}}\]larynx | |