Weeds affect the crop plants by
- Adominating the plants to grow
- Bkilling of plants in field before thy grow
- Call of these
- ✓competing for various resources of crops(plants) causing low availability of nutrients
Answer: D.
View full solution →Question types
Model Paper 8 question types
45 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
45
Questions
6
Question groups
5
Question types
01
M.C.Q. [1 M]
16 Q→02Assertion (A) & Reason (B) MCQ
4 Q→03Que-Ans (Each of 2 Mark )
8 Q→04Que-Ans (Each of 3 Mark )
9 Q→05Que-Ans (Each of 5 Mark )
5 Q→06Case study ( 4 Marks )
3 Q→Sample Questions
Model Paper 8 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following solutions has the highest mass by mass percentage?
- A20 g of sodium carbonate in 90 g of water
- B15 g of sugar in 160 g of water
- C10 g of sodium chloride in 200 g of water
- ✓60 g of potassium permanganate in 200 g of water
Answer: D.
View full solution →Metanil yellow, an adulterant used in Arhar dal is basically:
- ✓a dye
- Ban acid
- Ca detergent
- Da base
Answer: A.
View full solution →Kitchen of the cells
- AGolgi apparatus
- BEndoplasmic reticulum
- ✓Chloroplast
- DMitochondria
Answer: C.
View full solution →Lignified or thickened cell wall is a characteristic feature of
- Aphloem
- ✓xylem
- Cparenchyma
- Dcollenchyma
Answer: B.
View full solution →Assertion (A): Rutherford's atomic model was that it could not explain the stability of atoms.
Reason (R): Any charged particle during acceleration would radiate energy, and while revolving, it would lose its energy and eventually fall into the nucleus.
Reason (R): Any charged particle during acceleration would radiate energy, and while revolving, it would lose its energy and eventually fall into the nucleus.
- ✓Both A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false.
- DA is false but R is true.
Answer: A.
View full solution →Assertion (A): Blood is a fluid connective tissue.
Reason (R): It is composed of plasma, platelets, red blood cells, and white blood cells.
Reason (R): It is composed of plasma, platelets, red blood cells, and white blood cells.
- ABoth A and R are true and R is the correct explanation of A
- ✓Both A and R are true but R is not the correct explanation of A
- CA is true but R is false.
- DA is false but R is true.
Answer: B.
View full solution →Assertion (A): The conversion of gas directly into solid is called condensation.
Reason (R): Naphthalene leaves residue when kept open for some time.
Reason (R): Naphthalene leaves residue when kept open for some time.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false.
- ✓A is false but R is true.
Answer: D.
View full solution →Assertion (A): A bus moving due north takes a turn and starts moving towards the east with the same speed.There will be no change in the velocity of the bus.
Reason (R): Velocity is a vector quantity.
Reason (R): Velocity is a vector quantity.
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false.
- ✓A is false but R is true
Answer: D.
View full solution →An electron is regarded as a universal particle. Explain.
A stone of $1 \ kg$ is thrown with a velocity of $20\ ms^{-1}$ across the frozen surface of a lake and comes to rest after travelling a distance of $50 m$. What is the force of friction between the stone and the ice?
View full solution →A man throws a ball of mass 0.4 kg vertically upwards with a velocity of 10 m/s. What will be its initial momentum? What would be its momentum at the highest point of its reach?
How much water should be mixed with $12\ mL$ of alcohol so as to obtain a $12\%$ alcohol solution?
View full solution →Explain how sound is produced by your school bell.
Describe the types of connective tissues along with their functions.
What is the role of ribosmes and golgi body?
What are the differences between cell wall and cell membrane?
The velocity$-$time graph of a ball moving on the surface of a floor is shown in the figure. Find the force acting on the ball if the mass of the ball is $50 g$
View full solution →i. The potential energy of a freely falling object decreases progressively. What happens to its
a. Kinetic energy,
b. total mechanical energy?
State the law on which your answer is based.
ii. A household consumes 1 kWh of energy per day. How much energy is this in joules?
a. Kinetic energy,
b. total mechanical energy?
State the law on which your answer is based.
ii. A household consumes 1 kWh of energy per day. How much energy is this in joules?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, nonmalleable and are coloured.
i. Name a lustrous non-metal.
ii. Name a non-metal which exists as a liquid at room temperature.
iii. The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
iv. Name a non-metal which is known to form the largest number of compounds.
v. Name a non-metal other than carbon which shows allotropy.
vi. Name a non-metal which is required for combustion.
i. Name a lustrous non-metal.
ii. Name a non-metal which exists as a liquid at room temperature.
iii. The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
iv. Name a non-metal which is known to form the largest number of compounds.
v. Name a non-metal other than carbon which shows allotropy.
vi. Name a non-metal which is required for combustion.
i. Describe the role played by the lysosomes. Why are they termed as suicidal bags? How do they perform the function?
ii. What happens to the dry raisins, when placed in plain water for some time? State the reason for whatever is observed. What would happen if these raisins are then placed in concentrated salt solution?
ii. What happens to the dry raisins, when placed in plain water for some time? State the reason for whatever is observed. What would happen if these raisins are then placed in concentrated salt solution?
Why are mitochondria called powerhouse of the cell? Give three similarities and one difference between mitochondria and plastid.
A block of wood is kept on a tabletop. The mass of the wooden block is $5 \ kg$ and its dimensions are $40 \ cm \times 20 \ cm\times 10 \ cm$. Find the pressure exerted by the wooden block on the table top if it is made to lie on the table top with its sides of dimensions
$i. 20 \ cm \times 10 \ cm$ and
$ii. 40 \ cm \times 20 \ cm$.
View full solution →$i. 20 \ cm \times 10 \ cm$ and
$ii. 40 \ cm \times 20 \ cm$.
Define acceleration due to gravity. Derive an expression for acceleration due to gravity in terms of mass of the earth (M) and universal gravitational constant (G).
Read the following text carefully and answer the questions that follow:
A farmer has grown wheat on his field consecutively two times but when the third time he grows wheat on the same field the quality of the wheat was not up to the desired level. To improve the quality of his crops he uses chemical fertilizer but the condition of the crop became worse. One of his friends told him to grow a different variety of crops after wheat so as to grow two or three crops in a year with good harvests and use biological manure in place of chemical fertilizers which he prepares by animal excreta and plant waste to get the good quality of crops. He also told him about the good storage of his grains to protect them from the biotic and abiotic losses as in agriculture storage losses are very high.
i. What are the bases on which the next crop is decided to grow in the same field also name the process?
ii. What is the advantage of using biological manure over chemical fertilizers?
iii. Is it possible for the farmer to grow two crops at the same time if yes what is the requirement?
OR
Enlist the biotic and abiotic losses?
A farmer has grown wheat on his field consecutively two times but when the third time he grows wheat on the same field the quality of the wheat was not up to the desired level. To improve the quality of his crops he uses chemical fertilizer but the condition of the crop became worse. One of his friends told him to grow a different variety of crops after wheat so as to grow two or three crops in a year with good harvests and use biological manure in place of chemical fertilizers which he prepares by animal excreta and plant waste to get the good quality of crops. He also told him about the good storage of his grains to protect them from the biotic and abiotic losses as in agriculture storage losses are very high.
i. What are the bases on which the next crop is decided to grow in the same field also name the process?
ii. What is the advantage of using biological manure over chemical fertilizers?
iii. Is it possible for the farmer to grow two crops at the same time if yes what is the requirement?
OR
Enlist the biotic and abiotic losses?
Read the following text carefully and answer the questions that follow:
The animal body are covered by epithelial tissue. The epithelial tissue cover most of the organ and cavity with in the body. It also form barrier to keep different body systems separate. The skin, the lining of the mouth, lining of the blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. The oesophagus and lining of mouth are covered with squamous epithelium. Skin help in protecting the body. The columnar cell have hair-like projection called cilia. Cuboidal epithelium form lining of the kidney tubules and duct of salivary gland.
i. What type of cell are present where absorption and secretion occur?
ii. Skin helps in the protection of body explain?
iii. How cilia clear mucus?
OR
What is glandular epithelium?
The animal body are covered by epithelial tissue. The epithelial tissue cover most of the organ and cavity with in the body. It also form barrier to keep different body systems separate. The skin, the lining of the mouth, lining of the blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. The oesophagus and lining of mouth are covered with squamous epithelium. Skin help in protecting the body. The columnar cell have hair-like projection called cilia. Cuboidal epithelium form lining of the kidney tubules and duct of salivary gland.
i. What type of cell are present where absorption and secretion occur?
ii. Skin helps in the protection of body explain?
iii. How cilia clear mucus?
OR
What is glandular epithelium?
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