Question

please answer all questions its urgent

Answer 1

Pure substances are defined as substances that are made of only one type of atom or molecule. The purity of a substance is the measure of the extent to which a given substance is pure. The physical properties of a pure substance include well-defined melting and boiling points.

The Tyndall effect, also known as Willis–Tyndall scattering, is light scattering by particles in a colloid or in a very fine suspension. It is named after the 19th-century physicist John Tyndall.

Butter from curd can be separated by the technique of centrifugation.

Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun. The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.

Only metal liquid at room temperature is
Mercury (Hg), and only non metal liquid at room temperature is Bromine (Br). Answer: Metal Mercury and Non-metal Bromine exists in liquid state in room temperature.

The advantages of classifying organisms are as follows: (i) Classification facilitates the identification of organisms. (ii) helps to establish the relationship among various groups of organisms.

The five-kingdom system was developed by Robert H. Whittaker in 1969 and was built on the work of previous biologists such as Carolus Linnaeus. Living things can be classified into five major kingdoms: Kingdom Animalia. Kingdom Plantae.

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Answer 2

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$\textbf{Section - A (Physics)}$

$\textbf{Ans 1)}$

Force corresponds to the rate of change of angular momentum.

$\textbf{Ans 2)}$

m = 1 kg
a = 1 m/s
F = ?
F = ma
F = 1 kg × 1 m/s = 1 kg m/s
F = 1 N

$\textbf{Ans 3) a)}$

When an object is at the centre of the earth. Because at the centre of the earth g = 0. So, weight will be zero, but it have mass.

$\textbf{b)}$

Let m1 = 50 kg
and m2 = 120 kg
r = 10 m
G = 6.7 × 10-¹¹ Nm²kg-² (given)
F = ?
Now,
F = [(G m1 m2) ÷ r²]
F = [(6.7 × 10-¹¹ × 50 × 120) ÷ 100]
F = 4.0038 × 10-9 (10 ki power - 9) N

$\textbf{Ans 4)}$

Kepler's Third Law of Planetary Motion :- The square of time period of revolution of planet around the sun is directly proportional to the cube of length of semi major axis.
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$\textbf{Section - B (Chemistry)}$

$\textbf{Ans 1)}$

Bromine (Br) is the non metal which exists as liquid at room temperature.

$\textbf{Ans 2)}$

By the process of Centrifugation we separate butter from curd.

$\textbf{Ans 3)}$

Tyndall effect :- It is the process of scattering light by particles in a colloidal suspension.

Milk and starch solution shows Tyndall effect because they are colloidal solution and they can scatter the light which falls on them.

$\textbf{Ans 4) a)}$

Pure substance :- Which are made up of same kind of atoms and molecules. Also they have definite properties anad doesn't contain mixture.

Ex :- Damond and tin.

$\textbf{b)}$

Volume of solute = 50 ml
Volume of solvent = 50 ml
Volume of solution= 50 + 50 = 100 ml
Concentration percentage = (Volume of solute ÷ Volume of solution)
= [(50 × 100) ÷ 100]
= 50 %
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$\textbf{Section - C (Biology)}$

$\textbf{Ans 1)}$

Biodiversity :- Bio means living organisms and diversity means different variety. Living of all living organisms (plants and animals) in a particular habitat is know as biodiversity.

$\textbf{Ans 2)}$

* It tells about variations in all living organisms.

* More information can be obtained in less time.

$\textbf{Ans 3)}$

Five Kingdom classification system is given by R.H. Whittaker. This system includes - Monera
Protista
Fungi
Plantae
Animalia
On the basis whether the are Eukaryotic or Prokayotic. He also divide them on the basis of the cell wall, body structure etc.
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