290+ Biology-Physics-Chemistry (GK) Solved MCQs

1.

Which gland is not associated with human alimentary canal?

A. salivary glands
B. adrenal gland
C. liver
D. pancreas
Answer» B. adrenal gland
2.

In humans, bile juice is secreted by

A. pancreas
B. small intestine
C. esophagus
D. liver
Answer» D. liver
3.

An enzyme which can only act in acidic medium is

A. pepsin
B. trypsin
C. rennin
D. amylase
Answer» A. pepsin
4.

The part of digestive system where no digestion occurs

A. duodenum
B. esophagus
C. stomach
D. mouth
Answer» B. esophagus
5.

Which of the following animals has no need for a gall bladder?

A. horse
B. lion
C. dog
D. human
Answer» A. horse
6.

About how much saliva does a person produce each day?

A. 100 ml
B. 250 ml
C. 500 ml
D. 1500 ml
Answer» D. 1500 ml
7.

Saliva has the enzyme

A. pepsin
B. ptyalin
C. trypsin
D. rennin
Answer» B. ptyalin
8.

Curdling of milk in the stomach is due to the action of

A. pepsin
B. rennin
C. HCL
D. rennin
Answer» B. rennin
9.

Pepsinogen is secreted by

A. gastric glands
B. intestinal glands
C. chief cells
D. parietal cells
Answer» C. chief cells
10.

Pancreas has

A. only endocrine cells
B. only one type of cell, the same functioning both in an exocrine and endocrine fashion
C. two types of cells-exocrine and endocrine
D. only exocrine cells
Answer» C. two types of cells-exocrine and endocrine
11.

Largest gland in human body is

A. liver
B. pancreas
C. pituitary
D. thyroid
Answer» A. liver
12.

Grana refers to

A. glycolysis of glucose
B. by-product of photosynthesis
C. stacks of thylakoids
D. stacks of quantasomes
Answer» C. stacks of thylakoids
13.

A specific function of light energy in the process of photosynthesis is to

A. activate chlorophyll
B. split water
C. synthesis glucose
D. reduce CO2
Answer» A. activate chlorophyll
14.

ATP formation during photosynthesis is known as

A. phosphorylation
B. photophosphorylation
C. oxidative phosphorylation
D. substrate level phosphorylation
Answer» B. photophosphorylation
15.

Dark reaction in photosynthesis is called so because

A. it does not require light energy
B. cannot occur during daytime
C. occurs more rapidly at night
D. it can also occur in darkness
Answer» A. it does not require light energy
16.

Which of the following is connected with transport of water in plants?

A. phloem
B. xylem
C. epidermis
D. cambium
Answer» B. xylem
17.

The ultimate cause for movement of water against gravity in a tree is

A. osmosis
B. imbibitions
C. transpiration
D. photosynthesis
Answer» C. transpiration
18.

Which of the following is not an example of a selectively permeable membrane?

A. plasma lemma
B. cell Wall
C. mitochondrial membrane
D. chloroplast membrane
Answer» B. cell Wall
19.

Which of the following is responsible for guttation?

A. root pressure
B. transpiration
C. photosynthesis
D. osmosis
Answer» A. root pressure
20.

Phenyl mercuric acetate

A. reduces transpiration rate
B. reduces photosynthesis
C. kills the plant
D. reduce respiration
Answer» A. reduces transpiration rate
21.

Which of the following has no blood but respires?

A. earthworm
B. hydra
C. cockroach
D. fish
Answer» A. earthworm
22.

Which type of respiratory organs are present in spiders and scorpions?

A. book lungs
B. gill books
C. gills
D. lungs
Answer» A. book lungs
23.

At high altitude, RBCs of human blood will

A. increase in number
B. decrease in number
C. decrease in size
D. increase in size
Answer» A. increase in number
24.

Vocal cords occur in

A. pharynx
B. glottis
C. bronchial tube
D. larynx
Answer» D. larynx
25.

Which one of the following structures closes the respiratory passage during ingestion of food?

A. larynx
B. epiglottis
C. hard palate
D. soft palate
Answer» B. epiglottis
26.

The covering of lungs is called

A. pericardium
B. pleural membrane
C. perichondrium
D. peritoneum
Answer» B. pleural membrane
27.

The narrowest and most numerous tubes of lungs are termed as

A. bronchus
B. alveoli
C. bronchioles
D. hilum
Answer» C. bronchioles
28.

The exchange of gases in a mammal takes place is

A. trachea
B. bronchioles
C. bronchi
D. alveoli
Answer» D. alveoli
29.

Volume of air inspired and expired with each normal breath is called

A. tidal volume
B. inspiratory capacity
C. total lung capacity
D. residual volume
Answer» A. tidal volume
30.

Tidal volume of air in a normal healthy man during inspiration is about

A. 300 – 400 ml
B. 500 – 700 ml
C. 900 – 1000 ml
D. 100 – 250 ml
Answer» B. 500 – 700 ml
31.

The maximum possible volume of air, which can be inspiration, is called as

A. tidal air volume
B. vital lung capacity
C. complemental air volume
D. total lung capacity
Answer» B. vital lung capacity
32.

Percentage of O2 present in inhaled air in man is about

A. 21%
B. 78%
C. 1%
D. 43%
Answer» A. 21%
33.

Oxygen is transported in blood mainly by

A. leucocytes
B. erythrocytes
C. thromobocytes
D. blood plasma
Answer» B. erythrocytes
34.

Asthma is a respiration disease caused due to

A. infection of trachea
B. infection of lungs
C. bleeding into pleura cavity
D. spasm in bronchial muscles
Answer» D. spasm in bronchial muscles
35.

Mountain sickness results due to

A. anaemic hypoxia
B. arterial hypoxia
C. lack of sufficient RBCs
D. lack of sufficient WBCs
Answer» B. arterial hypoxia
36.

Which one of the following is the most common type of transpiration?

A. stomatal
B. lenticular
C. foliar
D. cuticular
Answer» A. stomatal
37.

The process of the escape of liquid from the tip of uninjured leaf or through hydathodes is called

A. transpiration
B. guttation
C. evapo-transpiration
D. evaporation
Answer» B. guttation
38.

In a closed circulatory system, blood is completely enclosed within

A. the skeleton
B. sinuses
C. vessels
D. hearts
Answer» C. vessels
39.

The smallest blood vessel in the body is a

A. capillary
B. artery
C. vena cava
D. vein
Answer» A. capillary
40.

Both erythrocytes and leucocytes are formed in the

A. bone marrow
B. thymus
C. arterial walls
D. lymph nodes
Answer» A. bone marrow
41.

An erythrocyte lives for approximately

A. one week
B. one month
C. four months
D. one year
Answer» C. four months
42.

The abnormal increase in the total RBC count is referred to as

A. pneumonia
B. polycythemia
C. leucopenia
D. anaemia
Answer» B. polycythemia
43.

The life span of human WBC is normally

A. 12–13 days
B. 80-90 days
C. 100-120 days
D. 20-30 days
Answer» A. 12–13 days
44.

The function of vitamin K is in

A. regulation of calcium and phosphorus metabolism
B. blood clotting
C. respiration
D. carbohydrate metabolism
Answer» C. respiration
45.

Oxygenated blood is carried by

A. pulmonary vein
B. pulmonary artery
C. hepatic portal vein
D. renal vein
Answer» A. pulmonary vein
46.

In mammals, oxygenated blood enters the heart at the

A. right atrium
B. left atrium
C. right ventricle
D. left ventricle
Answer» B. left atrium
47.

Which chamber of the heart has the thickest muscular walls

A. right atrium
B. left atrium
C. right ventricle
D. left ventricle
Answer» D. left ventricle
48.

When the right ventricle of heart contracts, the blood goes to

A. all parts of the body
B. Pulmonary arteries
C. aorta
D. lungs
Answer» D. lungs
49.

The tricuspid valve occurs between the

A. right auricle and right ventricle
B. pulmonary aorta
C. carotico-systemic aorta and left ventricle
D. left ventricle
Answer» A. right auricle and right ventricle
50.

Typical ‘lub-dub’ sound heard in heartbeat are due to

A. closing of bicuspid and tricuspid valves
B. closing of semilunar valves
C. closure of bicuspid-tricuspid valves followed by semilunar valves
D. blood under pressure through aorta
Answer» C. closure of bicuspid-tricuspid valves followed by semilunar valves
51.

What is blood pressure?

A. the pressure of blood on the heart muscle
B. the pressure of blood exerted on the walls of arteries and veins
C. the pressure of blood on the walls of veins only
D. the pressure of blood on the walls of arteries only
Answer» B. the pressure of blood exerted on the walls of arteries and veins
52.

Which one of following is called pace maker of the heart?

A. SA node
B. AV node
C. Chordae tendianae
D. AV septum
Answer» A. SA node
53.

Blood groups in man were discovered by

A. Mendel
B. Francis Nelson
C. S. Miller
D. Landsteiner
Answer» D. Landsteiner
54.

Rh factor was discovered by

A. William Harvey
B. Landsteiner
C. Robert Hook
D. C. De Duve
Answer» B. Landsteiner
55.

Rh factor is named after

A. Drosophila
B. a Monkey
C. a Rat
D. a Man
Answer» B. a Monkey
56.

Excretion means

A. removal of substances present in excess
B. formation of those substances that have some role in the body
C. removal of such substances that have never been part of the body
D. all of the above
Answer» A. removal of substances present in excess
57.

A mammal excretes nitrogen in the form of

A. ammonium ions
B. amino acids
C. urea
D. uric acid
Answer» C. urea
58.

Kidneys are not only organs of excretion. Their work is supplemented by

A. liver
B. heart
C. large intestine
D. skin
Answer» A. liver
59.

The basic unit of a vertebrate kidney is the

A. ureter
B. nephron
C. malpighian tubule
D. islets of Langerhans
Answer» B. nephron
60.

The two kidneys lie

A. at the level of ovaries
B. at the same level
C. left kidney at a higher level than the right one
D. right kidney at a higher level than the left one
Answer» C. left kidney at a higher level than the right one
61.

Function of glomerulus in mammalian kidney is

A. reasbsorption of salts
B. urine formation through blood filtration
C. urine collection
D. all of the above
Answer» B. urine formation through blood filtration
62.

The reabsorption of glucose in a nephron occurs in

A. loop of Henle
B. first half of proximal tubule
C. distal convoluted tubule
D. proximal part of collecting ducts
Answer» B. first half of proximal tubule
63.

Strongest cartilage is

A. hyaline cartilage
B. fibrous cartilage
C. elastic cartilage
D. none of the above
Answer» B. fibrous cartilage
64.

Striated muscles are found in

A. gallbladder
B. wall of bladder
C. leg muscles
D. lungs
Answer» C. leg muscles
65.

Strongest muscle in the body is present in

A. arm
B. jaw
C. thigh
D. neck
Answer» C. thigh
66.

Axial skeleton in man is made up of

A. 126 bones
B. 100 bones
C. 103 bones
D. 80 bones
Answer» D. 80 bones
67.

Skull of man is made up of

A. 10 bones
B. 22 bones
C. 30 bones
D. 24 bones
Answer» B. 22 bones
68.

Longest bone is that of

A. humerus
B. stapes
C. femur
D. radio-ulna
Answer» C. femur
69.

In man ribs are attached to

A. calvicle
B. ileum
C. sternum
D. scapula
Answer» C. sternum
70.

The smallest bone in mammals is

A. septomaxillary
B. dentary
C. femur
D. stapes
Answer» D. stapes
71.

The longest cell in the body of an animal is

A. osteocytes
B. neuron
C. chromatophores
D. lymph corpuscles
Answer» B. neuron
72.

Which cell stops dividing after birth?

A. glial cells
B. epithelium
C. liver
D. neuron
Answer» D. neuron
73.

The largest number of cells bodies of neurons in our body is found in

A. brain
B. spinal cord
C. tongue
D. retina
Answer» A. brain
74.

Which part of human brain is more developed in comparison of others?

A. cerebrum
B. cerebellum
C. optic lobes
D. medulla oblongata
Answer» A. cerebrum
75.

Which part of mammalian brain controls the muscular co-ordination?

A. cerebrum
B. cerebellum
C. corpus callosum
D. medulla oblongata
Answer» B. cerebellum
76.

There are how many pairs of spinal nerves in a human

A. 8
B. 12
C. 25
D. 31
Answer» D. 31
77.

There are how many pairs of cranial nerves in a human?

A. 8
B. 12
C. 25
D. 31
Answer» B. 12
78.

Pituitary gland is found in

A. around trachea
B. gonad
C. pancreas
D. brains
Answer» D. brains
79.

Which of the hormones is responsible for the emotional state such as fear and anger and causes rise of blood pressure and rate of heartbeat?

A. insulin
B. adrenaline
C. progesterone
D. thyroxine
Answer» B. adrenaline
80.

The main function of plasma membrane is to

A. maintain cell shape and size
B. control of all cellular activity
C. regulate the flow of materials into and out of the cell
D. store cell material
Answer» C. regulate the flow of materials into and out of the cell
81.

Function of a Centriole is

A. formation of spindle fibers
B. formation of nucleolus
C. initiation of cell division
D. formation of cell plate
Answer» A. formation of spindle fibers
82.

Functional activities of a cell are controlled by

A. nucleus
B. nucleolus
C. mitochondria
D. cytoplasm
Answer» A. nucleus
83.

Study of Algae is called

A. phycology
B. mycology
C. dendrology
D. mycology
Answer» A. phycology
84.

Which of the following is a non-poisonous snake?

A. cobra
B. python
C. viper
D. krait
Answer» B. python
85.

Which of the following diseases is caused by a virus?

A. typhoid
B. cholera
C. influenza
D. diphtheria
Answer» C. influenza
86.

DTP vaccine is given to infants to immunize them against

A. diphtheria, pneumonia and typhoid
B. diphtheria, whooping cough and tetanus
C. diarrhea, pneumonia and tuberculosis
D. diphtheria, whooping cough and typhoid
Answer» B. diphtheria, whooping cough and tetanus
87.

Jaundice is a disease of

A. kidney
B. pancreas
C. liver
D. duodenum
Answer» C. liver
88.

Male mosquito does not carry malarial parasite because:

A. it is too small to bite man.
B. it lacks the modified mouth parts
C. malarial parasites cannot reproduce in them.
D. female mosquito is more deadly
Answer» B. it lacks the modified mouth parts
89.

Continuous fever, headache, slow pulse, pain in the stomach, rose colored ashes are the major symptoms of

A. plague
B. typhoid
C. mumps
D. measles
Answer» D. measles
90.

Bark of which plant yields famous drug of malaria?

A. cinchona
B. quercus
C. betula
D. eucalyptus
Answer» A. cinchona
91.

Deficiency of vitamin C causes

A. rickets
B. beriberi
C. scurvy
D. night blindness
Answer» C. scurvy
92.

If there were no ultraviolet rays reaching the earth, human should suffer from deficiency of

A. fatty acids
B. essential amino acids
C. vitamin D
D. vitamin E
Answer» C. vitamin D
93.

Smog is a combination of

A. fire and water
B. smoke and fog
C. water and smoke
D. air and water
Answer» B. smoke and fog
94.

Sound becomes a hazardous noise pollution if its level is a above

A. 30 Db
B. 120 dB
C. 80 dB
D. 150 Db
Answer» C. 80 dB
95.

Maximum threat to the world is from (among the following)

A. global warming
B. ozone hole
C. water pollution
D. soil erosion
Answer» B. ozone hole
96.

Which of the following is the symbol of the metal that occurs in liquid form at ordinary temperature?

A. Na
B. Sn
C. Pb
D. Hg
Answer» D. Hg
97.

Which of the following is least compressible?

A. gas
B. liquid
C. solid
D. none of these
Answer» C. solid
98.

Which of the following is not a chemical change?

A. rusting of iron
B. converting water into steam
C. making curd from milk
D. heating coal
Answer» B. converting water into steam
99.

Atomicity of Phosphorous is

A. 1
B. 2
C. 4
D. 6
Answer» C. 4
100.

The number of atoms present in a molecule of an element is known as its

A. valency
B. atomicity
C. chemical Formula
D. symbol
Answer» B. atomicity
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