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CBSE MCQ Practice Test Online Free for Students
Quick Quiz
In plants, the role of cytokinin is:
(a) Promote cell division
(b) Wilting of leaves
(c) Promote the opening of stomatal pore
(d) Help in the growth of stem
Option a – Promote cell division
Sensory nerve of a reflex arc carries information from the receptor cells to the:
(a) Spinal cord
(b) Brain
(c) Muscles of the effector organ
(d) Bones of the receptor organ
Option a – Spinal cord
Which option correctly shows the order of events when a bright light is focused on our eyes?
(a) Bright light → Receptors in eyes → Sensory neuron → Spinal cord → Motor neurons → Eyelids close
(b) Bright light → Receptors in eyes → Spinal cord → Sensory neuron → Motor neurons → Eyelids close
(c) Bright light → Receptors in eyes → Sensory neuron → Motor neurons → Spinal cord → Eyelids close
(d) Bright light → Receptors in eyes → Spinal cord → Motor neurons → Sensory neuron → Eyelids close
Option a – Bright light → Receptors in eyes → Sensory neuron → Spinal cord → Motor neurons → Eyelids close
What is a likely limitation of electric impulses?
(a) The electric impulses travel slowly between the neurons
(b) The electric impulses allow signal transmission in multiple directions
(c) The electric impulses are transmitted to only those body parts that are connected to neurons
(d) The electric impulses, once generated, need to be transmitted quickly within the body
Option c – The electric impulses are transmitted to only those body parts that are connected to neurons
What can be a likely advantage of hormones over electric impulses?
(a) Hormones are secreted by all types of cells present in the body
(b) Hormones are secreted by stimulated cells and reach all cells of the body
(c) Hormones are relayed to the target organ at a faster rate than electric impulses
(d) Hormones do not depend on an external stimulus to be generated in the cells
Option b – Hormones are secreted by stimulated cells and reach all cells of the body
What is the function of the pituitary gland?
(a) To develop sex organs in males
(b) To stimulate growth in all organs
(c) To regulate sugar and salt levels in the body
(d) To initiate metabolism in the body
Option b – To stimulate growth in all organs
A female is suffering from an irregular menstrual cycle. The doctor prescribed her some hormonal tablets. Which hormone is she likely lacking in her body?
(a) Oestrogen
(b) Testosterone
(c) Adrenalin
(d) Thyroxin
Option a – Oestrogen
When we touch the leaves of the “touch-me-not” plant, they begin to fold up and droop. How does the plant communicate the information of touch?
(a) The plant uses electrical signals to transfer information from the external environment to cells.
(b) The plant uses electrical-chemical signals to transfer information from cell to cell.
(c) The plant uses electrical-chemical signals to transfer information from tissue to specialized cells.
(d) The plant uses electrical signals to transfer information from cell to specialized tissues.
Option b – The plant uses electrical-chemical signals to transfer information from cell to cell
During adolescence, the reproductive phase starts and:
(a) General growth rate begins to slow down.
(b) Height becomes less.
(c) The body weight is reduced.
(d) Hair growth decreases.
Option a – General growth rate begins to slow down
Which one of the given statements is incorrect:
(a) DNA has the complete information for a particular characteristic.
(b) DNA is the molecule responsible for the inheritance of characters from parents to offspring.
(c) Change in information will produce a different protein.
(d) Characteristics will remain the same even if protein changes.
Option d – Characteristics will remain the same even if protein changes
Which of the following methods of contraception protects from acquiring sexually transmitted diseases?
(a) Surgery
(b) Condoms
(c) Copper-T
(d) Oral pills
Option b – Condoms
In human males, the testes lie in the scrotum because it helps in the:
(a) Maintaining the temperature
(b) Formation of sperms
(c) Easy transfer of gametes
(d) Secretion of estrogen
Option b – Formation of sperms
The part of the flower which is present in the centre of the flower is:
(a) Sepals
(b) Petals
(c) Pistil
(d) Filament
Option c – Pistil
The seed that contains the future plant is called the:
(a) Cotyledons
(b) Seed coat
(c) Germ cells
(d) Embryo
Option d – Embryo
The period of pregnancy is called:
(a) Gestation period
(b) Incubation period
(c) Ovulation
(d) Menstruation period
Option a – Gestation period
The process of release of eggs from the ovary is called:
(a) Menstruation
(b) Reproduction
(c) Insemination
(d) Ovulation
Option d – Ovulation
The period during adolescence when the reproductive tissues begin to mature is called:
(a) Ovulation
(b) Puberty
(c) Germination
(d) Propagation
Option b – Puberty
In human beings, fertilization occurs in the:
(a) Uterus
(b) Ovaries
(c) Fallopian tubes
(d) Vagina
Option c – Fallopian tubes
Along the path of the vas deferens, the secretions of which gland provide nutrition to the sperms?
(a) Prostate glands
(b) Seminal vesicles
(c) Scrotum
(d) Urinary bladder
Option b – Seminal vesicles
The embryo in humans gets nutrition from the mother’s blood with the help of a special tissue called:
(a) Placenta
(b) Villi
(c) Uterus
(d) Womb
Option a – Placenta
Which among the following diseases is not sexually transmitted?
(a) Syphilis
(b) Corona
(c) HIV-AIDS
(d) Gonorrhea
Option b – Corona
During favourable reproduction conditions, Amoeba reproduces by:
(a) Multiple fission
(b) Binary fission
(c) Budding
(d) Fragmentation
Option b – Binary fission
A feature of reproduction that is common to Amoeba, Yeast, and Spirogyra is that:
(a) They reproduce asexually.
(b) They are all unicellular.
(c) They reproduce only sexually.
(d) They are all multicellular.
Option a – They reproduce asexually
The ability of a cell to divide into several cells during reproduction in Plasmodium is called:
(a) Budding
(b) Multiple fission
(c) Binary fission
(d) Reduction division
Option b – Multiple fission
Bryophyllum can be propagated vegetatively by the:
(a) Stem
(b) Leaf
(c) Root
(d) Flower
Option b – Leaf
Vegetative propagation refers to the formation of new plants from:
(a) Stem, flowers, and fruits
(b) Stem, leaves, and flowers
(c) Stem, roots, and flowers
(d) Stem, roots, and leaves
Option d – Stem, roots, and leaves
In a potato, vegetative propagation takes place by:
(a) Root
(b) Leaf
(c) Stem tuber
(d) Grafting
Option c – Stem tuber
Vegetatively propagated plants:
(a) Do not bear roots
(b) Do not bear buds
(c) Are genetically similar
(d) Are genetically dissimilar
Option c – Are genetically similar
Spirogyra reproduces by:
(a) Budding
(b) Fragmentation
(c) Regeneration
(d) Fission
Option b – Fragmentation
In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called:
(a) Filaments
(b) Hyphae
(c) Rhizoids
(d) Roots
Option b – Hyphae
Plants like banana, rose, jasmine, and orange have lost the capacity to produce:
(a) Seeds
(b) Buds
(c) Flowers
(d) Roots
Option a – Seeds
The flower of the Hibiscus plant is:
(a) Bisexual
(b) Unisexual
(c) Neuter
(d) Very small
Option a – Bisexual
The manufacturing of chlorofluorocarbon-free refrigerators is mandatory throughout the world. How will this help prevent ozone depletion?
(a) This will help convert oxygen molecules into ozone.
(b) This will reduce the production of CFC from oxygen molecules.
(c) This will reduce the release of CFCs that reacts with ozone molecules.
(d) This will reduce the release of ozone from oxygen molecules.
Option d – This will reduce the release of ozone from oxygen molecules
Which statement shows interaction of an abiotic component with a biotic component in an ecosystem?
(a) A grasshopper feeding on a leaf.
(b) Rainwater running down into the lake.
(c) An earthworm making a burrow in the soil.
(d) A mouse fighting with another mouse for food.
Option c – An earthworm making a burrow in the soil
What will happen if all the deer are killed in the given food chain?
Grass → Deer → Lion
(a) The population of grass decreases.
(b) The population of lions increases.
(c) The population of lions remains unchanged.
(d) The population of lions decreases, and grass increases.
Option d – The population of lions decreases, and grass increases
Which of the following sets belong to the same trophic level?
(a) Grass; Grasshopper
(b) Goat; Spider
(c) Hawk; Rat
(d) Frog; Lizard
Option d – Frog; Lizard
In an ecosystem, 10% of energy is transferred from one trophic level to the next in the form of:
(b) Chemical energy
(c) Mechanical energy
Option b – Chemical energy
Excessive exposure to ultraviolet radiation causes:
(a) Inflammation of the liver
(b) Cancer of the skin
(c) Damage to the lungs
(d) Jaundice
Option b – Cancer of the skin
Which of the following is an artificial ecosystem?
(a) Lake
(b) Forest
(c) Pond
(d) Crop field
Option d – Crop field
Acid rain is caused by the oxides of:
(a) Carbon
(b) Nitrogen only
(c) Sulphur only
(d) Sulphur and nitrogen
Option d – Sulphur and nitrogen
Which of the following is biodegradable?
(a) Aluminium can
(b) Polythene bag
(c) Cow dung
(d) DDT
Option c – Cow dung
Which of the following is an abiotic component of an ecosystem?
(a) Humus
(b) Bacteria
(c) Plants
(d) Fungi
Option a – Humus
Which one of the following pairs belongs to the category of primary consumers?
(a) Eagle and snake
(b) Grasshoppers and cattle
(c) Snake and frog
(d) Water beetles and fish
Option b – Grasshoppers and cattle
Which of the following chemicals causes depletion of the ozone layer?
(a) Carbon tetrachloride
(b) Methane
(c) Chlorofluorocarbon (CFC)
(d) Carbon monoxide
Option c – Chlorofluorocarbon (CFC)
In a food chain, the third trophic level is always occupied by:
(a) Herbivore
(b) Carnivore
(c) Decomposer
(d) Producer
Option b – Carnivore
The depletion of the ozone layer:
(a) Causes global warming
(b) Causes earthquakes
(c) Causes increased UV radiations
(d) Causes acid rain
Option c – Causes increased UV radiations
In the given food chain, if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake
(a) 4 kJ
(b) 40 kJ
(c) 400 kJ
(d) 4000 kJ
Option d – 4000 kJ
The magnetic field inside a long straight current carrying solenoid :
(a) is zero.
(b) decreases as we move towards its end.
(c) increases as we move towards its end.
(d) is same at all points.
Option d – is same at all points
A soft iron bar is introduced inside a current-carrying solenoid. The magnetic field inside the solenoid:
(a) will become zero
(b) will increase
(c) will decrease
(d) will remain unaffected
Option b – will increase
A magnetic field directed in the north direction acts on an electron moving in the east direction. The magnetic force on the electron will act:
(a) vertically upwards
(b) towards east
(c) vertically downwards
(d) towards north
Option c – vertically downwards
The direction of force on a current-carrying conductor in a magnetic field is given by:
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Right hand thumb rule
(d) Left hand thumb rule
Option a – Fleming’s left hand rule
The magnetic field due to a circular wire at its center is:
(a) in the plane of wire
(b) 30° to the plane of wire
(c) perpendicular to the plane of wire
(d) None of the above
Option c – perpendicular to the plane of wire
Two current-carrying conductors are held parallel. The nature of force between them is:
(a) attractive
(b) repulsive
(c) neither attractive nor repulsive
(d) attractive or repulsive depending upon the magnitude of the current
Option a – attractive
The best material to make permanent magnets is:
(a) aluminium
(b) soft iron
(c) copper
(d) alnico
Option d – alnico
The magnetic field lines always begin from:
(a) N-pole and end on S-pole
(b) S-pole and end on N-pole
(c) Start from the middle and end at N-pole
(d) Start from the middle and end at S-pole
Option a – N-pole and end on S-pole
The magnetic field is strongest at:
(a) middle of the magnet
(b) north pole
(c) south pole
(d) both the poles
Option d – both the poles
The material of the core of a strong magnet is:
(a) aluminium
(b) soft iron
(c) copper
(d) steel
Option b – soft iron
Magnetic lines of force inside a current-carrying solenoid are:
(a) perpendicular to the axis
(b) along the axis and are parallel to each other
(c) parallel inside the solenoid and circular at the ends
(d) circular
Option c – parallel inside the solenoid and circular at the ends
Two resistors of resistance 22 Ω and 4 Ω when connected to a battery will have:
(a) same current flowing through them when connected in parallel
(b) same current flowing through them when connected in series
(c) same potential difference across them when connected in series
(d) different potential difference across them when connected in parallel
Option b – same current flowing through them when connected in series
Two LED bulbs of 12 W and 6 W are connected in series. If the current through the 12 W bulb is 0.06 A, the current through the 6 W bulb will be:
(a) 0.04 A
(b) 0.06 A
(c) 0.08 A
(d) 0.12 A
Option b – 0.06 A
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become:
(a) four times
(b) two times
(c) half
(d) one fourth
Option c – half
100 J of heat is produced per second in a 4 Ω resistor. The potential difference across the resistor will be:
(a) 30 V
(b) 10 V
(c) 20 V
(d) 25 V
Option c – 20 V
Work of 14 J is done to move 2 C charge between two points on a conducting wire. What is the potential difference between the two points?
(a) 28 V
(b) 14 V
(c) 7 V
(d) 3.5 V
Option c – 7 V
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