Kharif season extends from
- AApril to June
- BJanuary to March
- ✓June to October
- DOctober to January
Answer: C.
View full solution →Question types
Model Paper 10 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 10 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Boiling points of a few gases are given below.
If liquid mixture of these gases is fractionally distilled, the order of gases distilling out from first to last is
| Gas | W | X | Y | Z |
| Boiling point (°C) | -152 | -246 | -196 | -183 |
If liquid mixture of these gases is fractionally distilled, the order of gases distilling out from first to last is
- AZ, X, Y, W
- ✓X, Y, Z, W
- CW, X, Y, Z
- DY, X, Z, W
Answer: B.
View full solution →Rusting of an article made up of iron is called
- Acorrosion and it is a physical as well as chemical change
- Bdissolution and it is a physical
- Cdissolution and it is a chemical change
- ✓corrosion and it is a chemical change
Answer: D.
View full solution →Which of the following cell functions will stop, if its ribosomes are destroyed?
- AFormation of complex sugars
- BLipid metabolism
- ✓Protein synthesis
- DATP synthesis
Answer: C.
View full solution →Which of the following tissues has dead cells?
- ACollenchyma
- BEpithelial tissue
- CParenchyma
- ✓Sclerenchyma
Answer: D.
View full solution →Assertion (A): Thomson's model of an atom is popularly known as the plum pudding or Christmas pudding model of an atom
Reason (R): According to the Thomson's plum pudding model, an atom is a positively charged sphere in which the electrons are embedded.
Reason (R): According to the Thomson's plum pudding model, an atom is a positively charged sphere in which the electrons are embedded.
- ✓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): 1-day Vinita went to see his brother's competition and he saw his brother in pain and not able to run comfortably.
Reason (R): Two bones can be connected to each other by another type of connective tissue called the ligament. This tissue is very elastic. It has considerable strength.
Reason (R): Two bones can be connected to each other by another type of connective tissue called the ligament. This tissue is very elastic. It has considerable strength.
- 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): A gas fills completely the vessel in which it is kept.
Reason (R): Intermolecular force of attraction between the particles of gas is negligible.
Reason (R): Intermolecular force of attraction between the particles of gas is negligible.
- ✓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): Motion with uniform velocity is always along a straight-line path.
Reason (R): In uniform velocity a motion, speed is the magnitude of the velocity and is equal to the instantaneous velocity.
Reason (R): In uniform velocity a motion, speed is the magnitude of the velocity and is equal to the instantaneous velocity.
- 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 →Find the percentage composition of sucrose $\ce{C_{12}H_{22}O_{11}}$.
View full solution →Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?
Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
A wooden table should be called a solid. Give reason.
Explain how defects in a metal block can be detected using ultrasound.
The transportation system of plants is composed of complex permanent tissue. They have their transportation system within themselves. Justify in detail with appropriate diagrams.
Write short note on nucleus.
What is the difference between plasma membrane and cell wall ? Give the functions of each one.
The following is the distance-time table of an object in motion:
i. What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing or zero?
ii. What do you infer about the force acting on the object?
| Time (s) | Distance (m) |
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 27 |
| 4 | 64 |
| 5 | 125 |
| 6 | 216 |
| 7 | 343 |
i. What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing or zero?
ii. What do you infer about the force acting on the object?
Give reason : An iron nail sinks in water, but a ship made of iron floats.
Name the process associated with the following:
i. Dry ice is kept at room temperature and at one atmospheric pressure.
ii. A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
iii. A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
iv. A acetone bottle is left open and the bottle becomes empty.
v. Milk is churned to separate cream from it.
vi. Settling of sand when a mixture of sand and water is left undisturbed for some time.
vii. Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.
i. Dry ice is kept at room temperature and at one atmospheric pressure.
ii. A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
iii. A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
iv. A acetone bottle is left open and the bottle becomes empty.
v. Milk is churned to separate cream from it.
vi. Settling of sand when a mixture of sand and water is left undisturbed for some time.
vii. Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.
i. State what will happen when human red blood cells are placed in a hypotonic salt/sugar solution.
ii. Why plant cell shrinks when kept in a hypertonic solution.
iii. Why lysosomes are known as suicidal bags?
ii. Why plant cell shrinks when kept in a hypertonic solution.
iii. Why lysosomes are known as suicidal bags?
i. Describe the role played by the lysosomes. Why are they termed as suicidal bags? How do they perform their 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?
i. Suppose the mass of the earth somehow increases by $10 \%$ without any change in its size. What would happen to your weight?
ii. Suppose the radius of the earth becomes twice of its present radius without any change in its mass. What will happen to your weight?
View full solution →ii. Suppose the radius of the earth becomes twice of its present radius without any change in its mass. What will happen to your weight?
$i.$ At some moment, two giant planets Jupiter and Saturn of the solar system are in the same line as seen from the earth. Find the total gravitational force due to them on a person of mass $50 \ kg$ on the earth. Could the force due to the planets be important?
Mass of the Jupiter $=2 \times 10^{27} \ kg$
Mass of the Saturn $=6 \times 10^{26} \ kg$
The distance of Jupiter from the earth $=6.3 \times 10^{11} m$
The distance of Saturn from the earth $=1.28 \times 10^{12} m$
$ii.$ A bag of sugar weighs $' w\ '$ at a certain place on the equator. If this bag is taken to Antarctica, then will it weigh the same or more or less. Give a reason for your answer.
View full solution →Mass of the Jupiter $=2 \times 10^{27} \ kg$
Mass of the Saturn $=6 \times 10^{26} \ kg$
The distance of Jupiter from the earth $=6.3 \times 10^{11} m$
The distance of Saturn from the earth $=1.28 \times 10^{12} m$
$ii.$ A bag of sugar weighs $' w\ '$ at a certain place on the equator. If this bag is taken to Antarctica, then will it weigh the same or more or less. Give a reason for your answer.
A solution of a solid in a liquid such as water can be prepared by adding it slowly to water with constant stirring at a certain temperature (room temperature). If the addition process is continued, a stage is ultimately reached in the dissolution process when no more of the solid dissolves. Rather it starts setlling at the bottom of the container such as a glass beaker. The solution at this stage is said to be saturated. The solubility of a solute is always expressed with respect to the saturated solution. It may be defined as the maximum amount of the solute that can be dissolved in 100 g of the solvent to form a saturated solution at a given temperature. Please remember that the role of temperature is very important. If temperature is increased, the solution becomes unsaturated. In case the temperature is decreased, the solution becomes supersaturated. As a result, crust of the solute gets deposited on the surface.
i. What do mean by the term Solubility?
ii. 20 g of a solute are dissolved in 500 g of the solvent. The solubility of the solute is:
iii. When a saturated solution becomes unsaturated?
OR
What do you mean by concentration of solution?
i. What do mean by the term Solubility?
ii. 20 g of a solute are dissolved in 500 g of the solvent. The solubility of the solute is:
iii. When a saturated solution becomes unsaturated?
OR
What do you mean by concentration of solution?
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