CBSE Class 6 - Science - CH11 - Light, Shadows and Reflection (MCQs)

Light, Shadows and Reflections

MCQs

Sun Dial at Jantar Mantar in Delhi.
Do you know it uses the principles of Light and Shadows?
Do you want to make your own Sun Clock (Dial)? See below.

Q1: Objects that emit light on their own are called ___________

(a) Ligth Objects
(b) Luminous bodies
(c) Non-Luminous bodies
(d) Opaque bodies

Q2: Which one of the following is not a luminous object?

(a) lit candle
(b) sun
(c) star
(d) moon

Q3: If we are able to see anything clearly through an object, then such an object is said to be a _______ object.

(a) transparent
(b) translucent
(c) opaque
(d) none of these

Q4: A _______ eclipse occurs when earth comes between sun and moon in a straight line.

(a) solar
(b) lunar
(c) shadow
(d) none of these

Q5: The shape of a shadow depends on which of the following.

CBSE Class 10 - NTSE SAT Quiz - 24

NTSE (SAT) Quiz-24

Q1: Which of the following is a plant hormone?

(a) Insulin
(b) Cytokinin
(c) Oestrogen
(d) Thyroxin

Q2: A wire with black insulation in a household electric supply is:

(a) live wire
(b) earth wire
(c) neutral wire
(d) fuse wire

Q3: A solution turns red litmus blue. The pH of the solution is:

(a) 7
(b) 1
(c) 5
(d) 10

Q4: Which one of the following is responsible for ozone layer depletion?

(a) CFC
(b) CO2
(c) SO2
(d) O2

Q5: The change of focal length of an eye lens is caused by an action of the

(a) pupil
(b) retina
(c) cilliary muscles
(d) iris

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 6 Science CH 9 The Living Organisms and Their Surroundings (MCQs)

The Living Organisms and Their Surroundings

MCQs based Class 6 NCERT Chapter 9 

Habitats

Q1: In the sea, plants and animals are surrounded by _________ water.

(a) fresh
(b) saline
(c) acidic
(d) marshy

Q2: The surroundings where organisms live is called a _______.

(a) habitat
(b) habit
(c) dwellings
(d) adaptation

Q3: In Cactus plants, the leafy kike structure in actual is a ______.

(a) leaf
(b) root
(c) flower
(d) stem

Q4: Sea animals like dolphins and whales breathe through ______.

(a) nose
(b) gills
(c) blow holes
(d) fins

Q5: Breathing activity is a part of which of the following bio-chemical process?

(a) photosynthesis
(b) respiration
(c) digestion
(d) excretion

CBSE Class 12 - Business Studies - CH9 - FINANCIAL MANAGEMENT (V Short Q and A)

FINANCIAL MANAGEMENT

Very Short Q & A

Q1: What do you mean by business finance?

Answer: The money required for carrying out business activities is called business finance.

Q2: What is Financial Management?

Answer: Financial Management is group of activities that are associated with optimal procurement as well as usage of finance.

Q3: Name the cheapest source of finance to a company.

Answer: Debt capital

Q4: What is wealth maximization concept?

Answer: It refers to primary aim of finance management i.e. to maximize shareholders’ wealth.

Q5: What is Financial Planning?

Answer: Financial Planning refers to determination of firms financial objectives, financial policies and procedures.

CBSE Class 10 Maths CH6 Triangles (Important Points You must Know)

Triangles: Important Points You must Know

1. Two figures are said to be similar if and only if they have same shape but not necessarily of same size.

2. All the congruent figures are similar but the converse is not true.

3. Two polygons of the same number of sides are similar if and only if
   (i) their corresponding angles are equal
   (ii) their corresponding sides are in proportion (same ratio).
 
4. Basic Proportionality Theorem (Thales Theorem):
   If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, then the other two sides are divided in the same ratio.(see figure above)
 

5. Converse of Basic Proportionality Theorem: If a line divides any two sides of a triangle in the same ratio, then the line is parallel to third side.

6. Similar Triangles: Two triangles are similar if and only if
   i.  their corresponding angles are equal i.e. they are equi-angular and
   ii. their corresponding sides are in the same ratio.
 
7. Criteria for establishing similarity of two triangles:
   i.   AA (or AAA) criterion of similarity
   ii.  SSS criterion
   iii. SAS criterion
   iv.  Altitude of right angle triangles

CBSE Class 6 Science CH13: Fun With Magnets (MCQs)

Fun With Magnets

Magnets come in various shapes. Can you name those shown?
(Answers given below?)

MCQs

Q1: In a bar magnet, magnetic power is

(a) more that both ends of the magnet.
(b) more in the middle of the magnet.
(c) is same through the magnet.
(d) none of these

Q2(NCERT): A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filling clinging to the

(a) North pole is almost equal to the south pole.
(b) North pole is much more than the south pole.
(c) North pole is much less than the south pole.
(d) Magnet will be same all along its length.

Q3: When a magnet is suspended freely in air with the help of string, it aligns itself in _________ direction.

(a) South-West
(b) North-East
(c) East-West
(d) North-South

Q5: Which of the following is a non-magnetic material?