# Class 09 NCERT Solutions

### NCERT Exemplar Problems Class 9 Science – Improvement in Food Resources

NCERT Exemplar Problems Class 9 Science – Improvement in Food Resources

Multiple Choice Questions (MCQs)

Question 1:
Which one is an oil yielding plant among the following?
(a) Lentil              (b) Sunflower                 (c) Cauliflower                   (d) Hibiscus

### NCERT Exemplar Problems Class 9 Science – Natural Resources

NCERT Exemplar Problems Class 9 Science – Natural Resources

Multiple Choice Questions (MCQs)

Question 1:
The atmosphere of the earth is heated by radiations which are mainly

### NCERT Exemplar Problems Class 9 Science – Why Do We Fall III

NCERT Exemplar Problems Class 9 Science – Why Do We Fall III

Multiple Choice Questions (MCQs)

Question 1:
Which one of the following is not a viral disease?
(a) Dengue                          (b) AIDS                    (c) Typhoid              (d) Influenza

### NCERT Exemplar Problems Class 9 Science – Sound

NCERT Exemplar Problems Class 9 Science – Sound

Multiple Choice Questions (MCQs)

Question 1:
Note is a sound
(a) of mixture of several frequencies                       (b) of mixture of two frequencies only
(c) of a single frequency                                             (d) always unpleasant to listen

### NCERT Exemplar Problems Class 9 Science – Work and Energy

NCERT Exemplar Problems Class 9 Science – Work and Energy

Multiple Choice Questions (MCQs)

Question 1:
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

### NCERT Exemplar Problems Class 9 Science – Gravitation

NCERT Exemplar Problems Class 9 Science – Gravitation

Multiple Choice Questions (MCQs)

Question 1:
Two objects of different masses falling freely near the surface of moon would
(a) have same velocities at any instant
(b) have different accelerations
(c) experience forces of same magnitude
(d) undergo a change in their inertia

### NCERT Exemplar Problems Class 9 Science – Force and Laws of Motion

NCERT Exemplar Problems Class 9 Science – Force and Laws of Motion

Multiple Choice Questions (MCQs)

Question 1:
Which of the following statement is not correct for an object moving along a straight path in accelerated motion?
(a) Its speed keeps changing                               (b) Its velocity always changes
(c) It always goes away from the earth              (d) A force is always acting on it

### NCERT Exemplar Problems Class 9 Science – Motion

NCERT Exemplar Problems Class 9 Science – Motion

Multiple Choice Questions (MCQs)

Question 1:
A particle is moving in a circular path of radius r. The displacement after half a circle would be
(a) zero              (b) nr                 (c) 2r                 (d) 2nr

### NCERT Exemplar Problems Class 9 Science – Diversity in Living Organisms

NCERT Exemplar Problems Class 9 Science – Diversity in Living Organisms

Multiple Choice Questions (MCQs)

Question 1:
Find out incorrect sentence
(a) Protista includes unicellular eukaryotic organisms
(b) Whittaker considered cell structure,mode and source of nutrition for classifying the organisms in five kingdoms
(c) Both Monera and Protista may be autotrophic and heterotrophic
(d) Monerans have well defined nucleus

### NCERT Exemplar Problems Class 9 Science – Tissues

NCERT Exemplar Problems Class 9 Science – Tissues

Multiple Choice Questions (MCQs)

Question 1:
Which of the following tissues has dead cells?
(a) Parenchyma                               (b) Sclerenchyma
(c) Collenchyma                              (d) Epithelial tissue

### NCERT Exemplar Problems Class 9 Science – The Fundamental Unit of Life

NCERT Exemplar Problems Class 9 Science – The Fundamental Unit of Life

Multiple Choice Questions (MCQs)

Question 1:
Which of the following can be made into crystal?
(a) A bacterium                        (b) An Amoeba                   (c) A virus                            (d) A sperm

### NCERT Exemplar Problems Class 9 Science – Structure of the Atom

NCERT Exemplar Problems Class 9 Science – Structure of the Atom

Multiple Choice Questions (MCQs)

Question 1:
Which of the following correctly represent the electronic distribution in the Mg atom?
(a) 3, 8,1                  (b) 2, 8, 2                   (c) 1,8, 3                     (d) 8, 2, 2

### NCERT Exemplar Problems Class 9 Science – Atoms and Molecules

NCERT Exemplar Problems Class 9 Science – Atoms and Molecules

Multiple Choice Questions (MCQs)

Question 1:
Which of the following correctly represents 360 g of water?
(i)   2 moles of H20
(ii)  20 moles of water
(iii) 022 x 1023 molecules of water
(iv)  12044 x 1025 molecules of water
(a) only (i)                                              (b) (i) and (iv)
(c) (ii) and (iii)                                       (d) (ii) and (iv)

### NCERT Exemplar Problems Class 9 Science – Is Matter Around us Pure

NCERT Exemplar Problems Class 9 Science – Is Matter Around us Pure

Multiple Choice Questions (MCQs)

Question 1:
Which of the following statements are true for pure substances?
(i)   Pure substances contain only one kind of particles.
(ii)  Pure substances may be compounds or mixtures.
(iii) Pure substances have the same composition throughout.
(iv) Pure substances can be exemplified by all elements other than nickel,
(a) (i) and (ii)           (b) (i) and (iii)            (c) (iii) and (iv)             (d) (ii) and (iii)

### NCERT Exemplar Problems Class 9 Science – Matter In Our Surroundings

NCERT Exemplar Problems Class 9 Science – Matter In Our Surroundings

Multiple Choice Questions (MCQs)

Question 1:
Which one of the following sets of phenomena would increases on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

### Science Chapter-13: Why Do We Fall Ill

Q1. State two conditions for good health.

### Science Chapter-06: Tissues

1. Define tissue.

### Science Chapter-05: The Fundamental Unit of Life

1) Who discovered cells, and how was it discovered ?

### Science Chapter-01: Matter in Our Surroundings

In Text Questions:

1) Which of the following is matter? Chair, air, love, smell, hate, almond, thought, cold, cold drink, smell of perfume.

### Science Chapter-04: Structure of the Atom

In Text Questions:

1)What are canal rays?

### Science Chapter-10: Gravitation

Question 1:

Why is it very difficult to hold a school bag with a long string and thin strap?

### Science Chapter-02: Is Matter Around Us Pure

In Text Questions:

1) What does a pure substance mean?

### Science Chapter-07: Diversity in Living Organisms

In Text Questions:

1) Why are organisms classified?

### Science Chapter-03: Atoms and Molecules

General Question: Illustrate the relationship between a mole, Avogadro’s number and Mass.

### Science Chapter-15: Improvement In Food Resources

QUESTIONS

1) What do fruits, vegetables, cereals and pulses provide us?

### Science Chapter-11: Work and Energy

Q1) A force 9N acts on a stone which has a displacement of 6 m, in the direction of the force. Considering that the force acts on the stone with the displacement. Determine the work done in this case?

### Science Chapter-14: Natural Resources

Question 1:

Compare the atmosphere of earth with that of Venus and Mars.

### Science Chapter-12: Sound

Que.1. When an object vibrates in a medium, it produces sound which reaches our ear. Explain how it is done.

### Science Chapter-08: Motion

Questions:

1) A man walks around a square street of side 10 m in 40 sec. Calculate the displacement of the man at the end of 2 minutes 20 seconds.

### Science Chapter-09: Force and Laws of Motion

1. Choose the one which has more inertia.

i-A Toy thrown up by a boy (or) A coin thrown up by a boy

ii-An apple falling from a tree (or) A rose falling from a plant

iii-A motorcycle (or) A bus

### Maths Chapter-09: Areas of Parallelograms and Triangles

Exercise-9.2

Q.1.In the given figure, PQRS is a parallelogram, $$PE \perp SR\, and \, RF\perp PS.$$.If PQ = 16 cm, PE = 8 cm & RF = 10 cm. Calculate AD.

### Maths Chapter-15: Probability

1. In an ODI match, a wicket keeper drops a catch 6 times out of 30 catches he gets. Find the probability of the wicketkeeper not dropping a catch.

### Maths Chapter-13: Surface Areas and Volumes

1. A matchbox measures 5cm × 1cm × 3.5cm. Determine the volume of a packet containing 14 such boxes.

### Maths Chapter-12: Heron’s Formula

Why Heron’s Formula…?

When the triangle is a right angled triangle:

Area = $$\frac{1}{2}\times base\times altitude$$

### Maths Chapter-10: Circles

1. Out of the two concentric circle ,the radius of the outer circle is 5cm and the chord FC is of length 8cm is a tangent to the inner circle .Find the radius of the inner circle.

### Maths Chapter-11: Constructions

Question-1 Construct an angle of $$90^{\circ}$$ at the initial point of a given ray and justify the construction.

### Maths Chapter-06: Lines and Angles

Q1: Lines AB and CD intersect at 0. If $$\angle AOC +\angle BOE= 70^{\circ}$$ and $$\angle BOD=40^{\circ}$$, find $$\angle BOE$$ and reflex $$\angle COE$$.

### Maths Chapter-04: Linear Equations in Two Variables

Q1. Solve the following.

1. A notebook costs twice as much as a pen. Give a linear equation in two variables to represent this statement.

### Maths Chapter-05: Introduction to Euclid’s Geometry

Exercise 5:1

Question 1 :

State true or false for the following statements mentioned below with the reason:

### Maths Chapter-02: Polynomials

Exercise – 1

Q.1.Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer:

(i)$$4x^{2}-3x+7$$

### Maths Chapter-03: Coordinate Geometry

Exercise 1
Q1. How will you describe the position of a mobile phone kept on the study table to another person?

Q1. The angles of quadrilateral are in the ratio $$3:5:9:13$$. Find the angles of the quadrilateral.

### Maths Chapter-01: Number Systems

1) Prove that zero as a rational number. Write zero in p/q, where p and q are integers and q ≠ 0?

### Maths Chapter-14: Statistics

Exercise 1

Q1) Give 5 scenarios of day to day life from which any type of data can be collected.

### Maths Chapter-07: Triangles

Exercise 1

Question 1:

In quadrilateral PQRS, PR = PQ and PQ bisects $$\angle P$$ (look at the fig.). Show that the $$\triangle PQR\ =\ \triangle PQS$$. What can you say about QR and QS?