CBSE Class 10 - Science - 1 Mark Questions Asked in Previous Question Papers (SA1 2012-2014)

Class X Science - SA1 - 1 Mark Questions

Questions Asked in Question Papers From 2012 To 2014

Q1 (2012): Name the sensory receptor found in the nose.

Answer: Olfactory receptors to detect the smell


Q2(2012): Name the sensory receptor found on the tongue.

Answer: Gustatory receptor to detect taste.


Q3(2012): Mention the angle between a current carrying conductor and magnetic field for which the force experienced by this current conductor placed in the magnetic field is the largest.

Answer: The force will be the largest when current carrying conductor and magnetic field direction is at a right angle to each other.


Q4(2012): Name a metal which is preserved in kerosene.

Answer: Sodium


Q5(2012): Name a metal which can melt while kept on a palm.

Answer: Gallium and Cesium


Q6(2012): Name the part of the brain which controls voluntary action.

Answer: Cerebrum or Forebrain

CBSE Class 10 - Science - SA1 - Sample Question Paper (2013-14)

Class 10 - Science -
SA1 - Question Paper (2013)

Time Allowed: 3 Hours                                                                                Maximum Marks: 90

---

General Instructions:
(i) The Question Paper comprises of two sections, A and B. Attempt both sections.
(ii) All questions are compulsory
(iii) All questions of Section A and all questions of Section B are to be attempted separately.
(iv) Question numbers 1 to 3 in Section A carry one mark each. These questions are to be answered in one word or in one sentence.
(v) Question numbers 4 to 6 in Section A are three marks questions. Answer each in about 30 words each.
(vi) Question Numbers 7 to 18 in Section A are three marks each. Answer each question not more than 50 words.
(vii) Questions 19 to 24 in section A are five marks each. Answer each question in not more than 70 words.
(viii) Questions numbers 25 to 33 in section B are multiple choice questions based on practical skills. Each question carries one mark.Select the most appropriate choice from the given choices.
(ix) Question Numbers 34 to 36 in Section B are questions based on practical skills and are two marks.

SECTION A

Q1:	Write the relation between electric power (W) of a device with potential difference (volt) across it and current (amp) flowing through it.	1
Q2:	Name two parts which constitute the central nervous system.	1
Q3:	Write the characteristic features of the micro organisms which help in the production of biogas in a biogas plant.	1
Q4:	Two solution A and B have pH 3 and 5 respectively. Which of the two solutions has more hydrogen ion concentration and which one is more acidic? Give reason for your answer.	2
Q5:	Give reason for the following: (a) Sodium metal is kept immersed in kerosene. (b) Blue colour of copper sulphate solution disappears when some aluminium powder is added in it.	2
Q6:	Give two reasons why different electrical appliances in a domestic circuit are connected in parallel.	2
Q7:	(i) Give reason ,”Magnetic field is strongest near the pole.” (ii) Describe an activity to show that magnetic field is strongest near poles of a bar magnet.

CBSE Class 10 Science - CH 14 - Sources Of Energy (Short Q and A)

Sources Of Energy

Short Q & A based on NCERT Chapter Source Of Energy

Q1: What are the important limitations of wind energy?

Answer:

1. Cost of maintaining wind energy is high
2. Wind energy farms can be established only at places where wind blows for greater part of year and speed is greater than 15 kmph.

Q2: What are hot spots?

Answer: Due to geological changes molten rock forms in deeper hot region of the earth's crust are pushed upwards which gets collected at some depth below the earth surface. These regions or places are called hot spots.


Q3: State one limitation in harnessing geothermal energy.

Answer: Geothermal hot spots are scattered. Usually these are some distance away from the area that needs energy.


Q4: What are the limitations in harnessing tidal energy?

Answer:

Few suitable places for building tidal energy farms.
Rise and fall of water is not enough to generate electricity on large scale.

CBSE Class 10 - Science - SA1 Question Paper (2014)

Science - Question Paper (2014)

Class 10 Science  Question Paper (SA1 - September 2014)

Time Allowed: 3 Hours                                                                            Maximum Marks: 90

---

General Instructions:
(i) The Question Paper comprises of two sections, A and B. Attempt both sections.

(ii) All questions are compulsory

(iii) All questions of Section A and all questions of Section B are to be attempted separately.

(iv) Question numbers 1 to 3 in Section A carry one mark each. These questions are to be answered in one word or in one sentence.

(v) Question numbers 4 to 6 in Section A are three marks questions. Answer each in about 30 words each.

(vi) Question Numbers 7 to 18 in Section A are three marks each. Answer each question not more than 50 words.

(vii) Questions 19 to 24 in section A are five marks each. Answer each question in not more than 70 words.

(viii) Questions numbers 25 to 33 in section B are multiple choice questions based on practical skills. Each question carries one mark.Select the most appropriate choice from the given choices.

(ix) Question Numbers 34 to 36 in Section B are questions based on practical skills and are two marks.

SECTION A

Q1:	Name the two components of peripheral nervous system?	1
Q2:	What are hot spots inside the earth's crust?	1
Q3:	A charge of 150 C flows through a wire in one minute. Find the electric current flowing through it.	1
Q4:	Explain why an aqueous solution of sodium sulphate is neutral while an aqueous solution of sodium carbonate is basic in nature.	2
Q5:	When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state: (i) the substance oxidised. (ii) the substance reduced in the reaction.	2
Q6:	Why do herbivores have longer, smaller intestine than carnivores?

CBSE Class 10 Science CHEMICAL REACTIONS AND EQUATIONS - Board Questions (2008-2014) and Answers

CHEMICAL REACTIONS AND EQUATIONS

Board Questions (2008-2014) and Answers

Q1(2008): What happens chemically when quick lime is added to water?

Answer: Quick lime is CaO which reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

                           CaO(s) + H₂O(l) → Ca(OH)₂(aq)

Q2: A student burns magnesium ribbon in the lab and observes a white powder falling on the table. What type of reaction has taken place and name the white powder?

Answer: It is a chemical reaction. The white powder formed is magnesium oxide (MgO).

Q3: What are the essentials of a chemical reaction?

Answer:

• It should be balanced and confirm to the law of conservation of matter
• It should be molecular
• It must refer to an actual chemical equation

Q4: How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Answer: When a burning match stick is brought near the mouth of the test tube in which reaction is taking place, it will burn with popping sound. It detects the presence of hydrogen (H₂) gas.

Q5: What change in colour is observed when white silver chloride is left exposed to sunlight? What type of chemical reaction is this?

Answer: White silver chloride turns grey in sunlight. This is due to the decomposition of silver chloride into silver and chlorine by light.It is a photo-chemical decomposition reaction.

                2AgCl(s) —^Sunlight—→ 2Ag(s) + Cl₂(g)

Q6: Why is respiration considered as exothermic process?

Answer: In respiration heat is released so it is termed as an exothermic reaction.

                   C₆H₁₂O₆ + 6O₂ —→ 6CO₂ + 6H₂O + energy

Q7(2010):What is meant by skeletal equation?

Answer: The equation which is unbalanced because the mass is not the same on both sides of the equation, is a skeletal chemical equation for a reaction.

During exam, try to write chemical equations and chemical formulae in your answers wherever possible. It enhances visibility and gives you more scores.

Q8: Identify the type of reaction in the following example:

Na₂SO₄(aq) + BaCl₂(aq) —→ BaSO₄(s) + 2NaCl(aq)

Answer: A double displacement reaction.

Q9: Why are bags of chips flushed with nitrogen gas?

Answer: Chips manufacturers usually flush bags of chips with gas such as nitrogen to prevent the chips from getting oxidised.

Q10 : What is precipitation reaction?

CBSE Class 10 - Science - CH2 - Acids, Bases and Salts (Worksheet)

Acids, Bases and Salts

credits:clker.com

Worksheet

Fill in the Blanks

1. Blue litmus changes into red colour in the presence of_______.

2. The acid present in lemon juice is _______.

3. Red litmus changes into blue colour in the presence of ______.

4. The chemical name of Plaster of Paris is ___________ and its chemical formula is ____________.

5. Methyl orange gives __________ in basic medium while phenolphthalein gives _______.

6. Example for strong acid is ________.

7. Example for weak acid is ________

8. Example for strong base is_______.

9. Example for weak base is ____________

CBSE Class 6-12 - Science - Fathers in Biology

℉α⊥нεяṧ ◎ḟ Ⅴαґḯøü﹩ ℬґαηḉℌ℮ṧ їη ℬїøł☺ℊ¥

Fathers of Various Branches in Biology

Aristotle - Father of Biology
credits: wikipedia

Num.	Branch of Biology	Name
1	Father of Biology	Aristotle
2	Father of Zoology	Aristotle
3	Father of Botany	Theophrastus
4	Father of Taxonomy	Carl Linnaeus
5	Father of Plant Physiology	Stephen Hales
6	Father of Bacteriology	Louis Pastuer
7	Father of Microbiology	Leeuwenhoek
8	Father of Immunology	Edward Jenner
9	Father of Cytology	Robert Hooke
10	Father of Mycology	Micheli
11	Father of Genetics	G J Mendel
12	Father of Experimental Genetics	T. H. Morgan
13	Father of Bryology	Johann Hedwig
14	Father of Eugenics	Francis Galton
15	Father of Microscopy	Marcello Malphigi
16	Father of Bio-diversity	E.O. Wilson
17	Father of Medicine	Hippocrates
18	Father of modern Anatomy	Andreas Vesalius
19	Father of Radiation Genetics	H. J. Muller

CBSE Class 10 - Science - SA1 - Sample Question Paper (2014-15)

Class X (Science) Sample Question Paper SA-I (2014-15)

Sample Q Paper by DPS Chandigarh.

Summative Assessment-I (2014-15)

	Sample Question Paper - Class-X - SCIENCE - TIME : 3 ½ Hrs	Maximum Marks : 90
	Instructions:
	i) The question paper comprises of two sections, A and B. You are to attempt both the sections.
	ii) All questions are compulsory.
	iii) There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such questions is to be attempted.
	iv) All questions of section A and all questions of section B are to be attempted separately.
	v) Questions 1 to 3 in section A are one mark questions. These are to be answered in one word or one sentence.
	vi) Questions 4 to 6 in section A are two marks questions. These are to be answered in about 30 words each.
	vii) Questions 7 to 18 in section A are three marks questions. These are to be answered in about 50 words each.
	viii) Questions 19 to 24 in section A are five marks questions. These are to be answered in about 70 words each.
	ix) Questions 25 to 33 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. Questions 34 to 36 in section B are two mark question.
	Section A
1.	What are biocatalysts?
2.	Name any one metal which is found in its free state in nature.
3.	Suggest any two reasons which make the large scale usage of nuclear energy prohibitive.
	Name the type of the reaction and product formed when magnesium reacts with air or oxygen.
5.	a) Name the gland which releases thyroxin.
	b) State the function of thyroxin.
6.	State two differences between artery and vein on the basis of a) type of blood it carries b) valves
7.	Differentiate between renewable and non-renewable sources of energy with one example for each.
8.	Resistances of three resistors are given as R1=20Ω, R2 = 40Ω and R3 = 60Ω. Calculate the effective resistance when they are connected in series. Also calculate the current flowing when the combination is connected to a 6V battery.

CBSE Class 10 - Science - CH 8. CONTROL AND COORDINATION

CONTROL AND COORDINATION

MCQs

Q1: The plant hormone which is essential for cell division is:

(a) Auxin
(b) Cytokinin
(c) Ethylene
(d) Gibberellin


Q2: The gap between two neurons is called _____

(a) Synapse
(b) Axon
(c) Synthesise
(d) Dendron


Q3: A potted plant is kept in a room. It starts to bend towards the direction of light. This type of movement is known as

(a) Photographism
(b) Photoperiodism
(c) Phototropism
(d) Photocynism


Q4: Tropic movements are

(a) in response to light
(b) in response to gravity
(c) non-directional
(d) unidirectional

CBSE Class 10 - Science - CH2 - Acids, Bases and Salts (MCQs)

Acids, Bases and Salts

credits:clker.com

MCQs

Q1: The most commonly used indicator in laboratory is
(a) Methyl Orange
(b) Litmus
(c) Phenolphtalein
(d) Universal Indicator

Q2: Which gas is released when a metal reacts with an acid?

(a) Cl₂

(b) O₂
(c) H₂
(d) SO₂


Q3: The strength of acid depends upon

(a) density of the acid
(b) oxygen atoms present
(c) number of hydrogen atoms present in the molecule
(d) concentration of H+ ions furnished by the acid


Q4: Which statement is incorrect?

(a) Acids have pH more than 7
(b) Acids give H⁺ ions in water
(c) Acid conduct electricity in aqueous solution
(d) Acids turn blue litmus red.


Q5: Which of the following substance is antacid?

CBSE Class 10 - Science - Ch6 - Gist on Excretory System (Life Processes)

Gist on Excretory System

(Short Q & A)

A Pair Of Kidneys
(image credits: openclipart)

Q1: Define Excretion.

Answer: Excretion is a biological process by which an organism gets rid of metabolic toxic wastes from its body.

Q2: List the toxic wastes of metabolism.

Answer: These wastes are nitrogenous materials i.e. ammonia, urea and uric acid, carbon dioxide, inorganic salts, excess of water.

Q3: What is Osmoregulation? 

Answer: It is a process that maintains the amount of water and ionic balance in the body.

Q4: Where Urea is formed in mammals?

Answer: Urea is made in the liver via the ornithine cycle by combining the ammonia
made by deamination with carbon dioxide made from respiration

Q5: What are the major excretory products of plants?

CBSE Class 10 - Science - CH13 - Magnetic Effects of Electric Current

Magnetic Effects of Electric Current

Q & A

Morse Telegraph which uses Magnetic effect of Current
image credits: classroomclipart.com

Q1: What is meant by Magnetic effect of Electric current?

Answer: It means that a current flowing in a wire produces a magnetic field around it. In other words, electric current can produce magnetism.


Q2: What is a magnet?

Answer: A magnet is an object which attracts pieces of iron, steel, nickel and cobalt.


Q3: What is a Bar magnet?

Answer: A bar magnet is a long rectangular bar of uniform cross-section which attracts pieces of iron, steel nickel and cobalt.

    ➳ Like poles repel, while unlike poles of magnets attract each other.

Q4: Define Magnetic field:

CBSE Class 10 - Science- KVS - Sample Question Paper-2014

CBSE Class 10 - Science- Sample Question Paper-2014

CBSE Class 10 - Science - Value Based Questions -1 (SA2)

Value Based Questions 

courtesy: openclipart.org

[PERIODIC CLASSIFICATION OF ELEMENTS]

Q1: Priyanka is well maintained and organized. Her notebooks have indices properly filled and are timely checked. She is in good books of the teachers. On the other hand Sakshi is un-organized. Often her homework is incomplete and she has to deal with such situations many a times.

(a) Do you think being organized is helpful in life?
(b) Based on the above said example, how can you relate it to classification of elements?

Answer:
(a)   Keeping things organized and disciplined help in saving time and energy. It makes life simple and easy.

(b) As in our daily life keeping things organized is quite helpful, similarly classifying elements help us study elements behaviour and properties systematically. 


Q2: Mendeleev left some gaps in his periodic table and predicted the discovery of new elements. Even though it was a drawback he boldly presented his table. What values do you learn from Mendeleev's decision?

Class 10 - Biology - How do Organisms Reproduce? (Fill In Blanks)

Class 10 - Biology - How do Organisms Reproduce? 

Cross-section of Flower
credits: clker.com

Fill in the Blanks

[Asexual Reproduction in Plants]

1. The ability of plant cells to give rise to whole plant is called as ____.

2. In Asexual reproduction the gametes are ______ (formed/not formed).

3. In yeasts, ____ is the most common type of asexual reproduction.

4. In grafting, the union occurs through formation of ____ between the two grafts.

5. The process of formation of spores is called ____.

6. Asexual reproduction method in spirogyra is called _______.

7. Orchids and Ornamental Plants are generally reprodued asexually. One of the common vegetative propagation technique used for these plants is _______.

[Sexual Reproduction in Plants]

CBSE Class 10 - Science - March 2014 - Question Paper Design and Sample Questions

CBSE Class 10 - Science - March 2014 - Modified Syllabus, Question Paper Design and Sample Questions

CBSE Class 10 - Science - Ch 11 - The Human Eye and the Colourful World (MCQs)

The Human Eye and the Colourful World

Dispersion of Light
Which light bends the most?
credits:wpclipart

(MCQs)

Q1: By which optical phenomenon, the splitting of white light into seven constituent colours occur?
(a) Refraction
(b) Reflection
(c) Dispersion
(d) Interference


Q2: A human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This phenomenon is due to:

(a) near sightedness
(b) long sightedness
(c) accomodation
(d) persistence of vision


*Q3: Which of the following are the primary colours?
(a) Red, Blue, Yellow
(b) Red, Green, Violet.
(c) Yellow, Green Blue
(d) Red, Green, Blue


Q4(NCERT): The human eye forms the image of an object at its
(a) cornea
(b) iris
(c) pupil
(d) retina

CBSE Class 10 - Science - CH14 - Source Of Energy (MCQs)

Sources of Energy

MCQs

Q1: Green house effect is caused by gases like
(a) Helium
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide


Q2: A solar water heater cannot be used to get hot water on
(a) a sunny day
(b) a cloudy day
(c) a hot day
(d) a windy day

CBSE Class 10- Science - SA1 Sample Question Paper 2013 by KVS Delhi

Class 10- Science - SA1 Sample Question Paper 2013 by KVS Delhi

CBSE Class 10 - Science - CH3 - Metals and Non-Metals

Metals and Non-Metals

Q & A

Q1: List any five physical properties of metals.

Answer: Physical properties of metals are:

1. Metals are usually hard (exceptions are: sodium and potassium).
2. These are sonorous.
3. These are lustrous.
4. Metals exhibit malleability and ductility.
5. Mostly they are solids (exception is mercury)
6. They exhibit high tensile strength.
7. These have high densities.

Q2: Are metals electronegative or electropositive?

Answer: Metals are electropositive i,e. they form cations by loosing electrons.

Q3: Define Malleability.

Answer: Malleability is the property of a metal, by which it can be beaten into thin sheets.

Q4: Name a metal which can be cut with a knife?

Answer: Sodium