Category: SciFun

Solve This

A king once condemned a prisoner and wanted to give him a very harsh punishment. He keeps a glass containing some hydrochloric acid and another containing an equal amount of sodium hydroxide before the prisoner and asks him to drink both of them. The prisoner knows that the acid is highly corrosive and will destroy the mucous lining, as well as his oesophagus.

The other solution is equally bad and will cause him to collapse. But he goes ahead and obeys the order. The king finds that the prisoner has survived without any ill effects. How did he manage it?

Answer:

The prisoner understood the chemical reactions well. He knew that an acid is always neutralized by an alkali. So he poured the liquids in the two glasses into a third empty glass. When they thus got mixed, they reacted producing salt and water. These were harmless, except for the salty taste!

HCl + NaOH = H 2 O + NaCl

-Team ScienceNow

Asha was having a candlelight dinner. So she lit a big candle and placed it on the table. It was a very windy day and the candle was extinguished. She lit it again, but again the candle went off.

She did not want to close the window because it would have been too hot then. So she found a glass tube and placed it on the candle as a cover. But midway through dinner she found that the candle had got extinguished in spite of the cover.

Why did that happen?

Answer:

Burning of any fuel is essentially an oxidation reaction. The fuel needs oxygen in the air to burn. If there is no oxygen, then the fuel howsoever inflammable, cannot burn. When Asha put a glass tube over the candle, there was some air inside the tube and hence there was a supply of oxygen. However, after some time, the flame in the candle had used up all the available oxygen replacing it with carbon dioxide which was a by-product of the burning process. As no more oxygen was available, the candle could not burn any more and got extinguished.

-Team Science Now

Let’s Check your IQ….

1. Which of the following is a large blood vessel that carries blood away from the heart?
A. Vein
B. Artery
C. Capillary
D. Nerve

2. Which of the following is not a member of the Vitamin B complex?
A. Thiamine
B. Riboflavin
C. Folic acid
D. Ascorbic acid

3. Fungi are plants that lack:
A. Oxygen
B. Carbon dioxide
C. Chlorophyll
D. None of these

4. What makes a reptile a reptile?
A. Cold blooded
B. Warm Blooded
C. Non-Hearing
D. Egg-laying

5. Which blood vessels have the smallest diameter?
A. Capillaries
B. Arterioles
C. Venules
D. Lymphatic

6. Tell the composition of soap?
A. Sodium salt with fatty acids.
B. Potassium salt with fatty acids
C. Both a & b
D. Sodium and Potassium salt mixed with chemicals

7. Which of the following compound is not used as an alkali?
A. Sodium hydroxide
B. Potassium hydroxide
C. Carbon hydroxide
D. Nitrogen hydroxide

8. Which acid is present in lemon?
A. marlic acid
B. citric acid
C. lactic acid
D. tartaric acid

9. Natural rubber is a ________ which is having high elasticity.
A. Substance
B. Material
C. Elastomer
D. Chemical using carbon as main compound

10. Which of the following is not a type of elements?
A. Metals
B. Non Metals
C. Metalloids
D. Gases

11. What is the full form of ASLV?
(A) Augmented Satellite Launch Vehicle
(B) Automatic Satellite Launch Vehicle
(C) Aero Space Launch Vehicle
(D) Area Satellite Launch Vehicle

12. Which is India's first experimental satellite launch vehicle?
(A) ASLV
(B) GSLV
(C) SLV 3
(D) None of these

13. When was the Indian Space Research Organisation (ISRO) was set up?
(A) 1962
(B) 1969
(C) 1972
(D) 1952

14. Where is the Headquarter of ISRO?
(A) Chandipur
(B) Bengaluru
(C) Mahendragiri
(D) Chennai

15. The weight of an Object on planet Mars is 348 N. Then what will be the mass of the object?
(A) 100 Kg
(B) 100 Gm
(C) 3.48 Kg
(D) 348 Kg

16. A boy standing at a distance of 172.5 meter from the base of tower shouted 'Hello'. After
what time can the boy hear the echo if the speed of sound is 345 meter per second?
(A) 0.5 sec.
(B) 1 sec.
(C) 1.5 sec.
(D) 2 sec.

17. On what principle is the construction of submarine based on?
(A) Law of gravitation
(B) Law of Inertia
(C) Pascals law
(D) Archimedesprinciple

18. A car travels 500 m distance in 3 minutes. What will be its speed in kilometre per hour?
(A) 120
(B) 100
(C) 15
(D) 30

19. Find the power of an engine working at the rate of 60 Joule/min?
(A) 60 watts
(B) 10 watts
(C) 0.1 watt
(D) 1 watt

20. When an object is kept between two plane mirrors making a certain angle, 5 images are
formed. What is the measure of an angle between the plane mirrors?
(A) 60 degree
(B) 90 degree
(C) 120 degree
(D) 72 degree

21. In which pair, units of given physical quantities are different?
(A) speed, velocity
(B) energy, work
(C) density, volume
(D) weight, force

22. The fluorescent tubes and neon sign bulbs glow because of ___________
(A) High density of gases
(B) High temperature of gases
(C) High applied voltage
(D) Presence of charged particles

23. The ratio of the masses of moving objects X and Y having equal momentum is 1:2.
Determine the ratio of their velocities.
(A) 2:1
(B) 1:2
(C) 4:1
(D) 1:4

24. Which of the following does not have methane as a major component?
(A) LPG
(B) LNG
(C) CNG
(D) Biogas

25. The batteries in the satellite are recharged by _____________
(A) Changing chemicals in the batteries
(B) Changing electrodes in the batteries
(C) Solar panels when there is sunlight
(D) Photo electric cell at any time when necessary

-Team ScienceNow

 

ANS
1.b, 2.d, 3.c, 4.d, 5.a, 6.c, 7.d, 8.b, 9.c, 10.d, 11.a, 12.c,
13.b, 14.b, 15.a, 16.b, 17.d, 18.b, 19.d, 20.a, 21.c, 22.d, 23.a, 24.a, 25.d

Riddle – Science Teaser

SOLVE THIS

Clumsy Vijay got himself into a ticklish situation. He had poured water into two bottles. One of them had ethanol in it while the other had some oil. Now he wanted to take the water out of them. Can you help him do that?…

SOLUTION

The solution to Vijay’s problem is rather simple. Oil and water do not mix. So it would be easy to separate them. All that he would have to do is to pour the liquid from that particular bottle into a separation funnel. If he now gives it some time the two immiscible liquids would separate with a clear demarcation line. He should now resort to the process of decantation. If he merely pours out oil in the top layer, the remaining liquid will be water. If he uses the separation funnel he can open the tap at the bottom and let water come out. On the other hand, ethanol which is an alcohol mixes with water so mere decantation will not help. He should employ the technique of fractional distillation. Fortunately for Vijay alcohol boils at a much lower temperature than water. So he can let alcohol evaporate at that temperature and then collect the remaining water

-Team ScienceNow

 

Get set to test Your IQ…

1. Which processes are responsible for falling of rain?
(A)Evaporation
(B) Sublimation
(C) Condensation
(D) Liquefaction
A. E & G
B. E & F
C. F & G
D. H & E

2. Germs in the water can be killed by __________.
A. Condensation
B. Boiling
C. Filtration
D. Decantation

3. Which natural phenomenon is responsible to produce ozone gas?
A. Water cycle
B. Hail storm
C. Lightning
D. Earthquake

4. Which of the following firecracker replicate the principle of launching of satellite?
A. Atom bomb
B. Anar
C. Bhuichakrn
D. Rocket

5. In what form is energy stored in cooking gas?
A. Light
B. Heat
C. Light and Heat
D. Chemical

6. What is 7 + 7 ÷ 7 + 7 × 7 – 7 =
A. 0
B. 42
C. 50
D. 57

7. A 250-meter-long train crosses a pole in 15 seconds. What is its speed in km/hr?
A. 90
B. 45
C. 70
D. None of these

8. Rs. 180 is stored in a box in the form of 1 Rupee coins, 50 paisa coins. Their ratio is 2:3:4. Find the no. of 50 paisa coins.
A. 60
B. 120
C. 150
D. 180

9. The average of first three numbers is three times of the fourth number. If the average of all four numbers is 5, then find the fourth number.
A. 4.5
B. 5
C. 2
D. 4

10. Diagonal of a square is 12√2. Find the ratio between the area of this square and that of square drawn on diagonal.
A. 2:1
B. 1:1
C. 1:2
D. 1:3

11. From where can one see the sun rising from the west?
A. Saturn
B. Venus
C. Mars
D. Mercury

12. How many rotations does the earth take in its one revolution?
A. 365
B. 367
C. 364
D. 430

13. Which of these contain large quantities of ice?
A. Asteroids
B. Stars
C. Comets
D. Black holes

14. India’s satellite launchpad is located at ___________.
A. Thumba
B. Sriharikota
C. Ahmedabad
D. Dehradun

15. About how many galaxies are there in the Universe?
A. 25 Million
B. 25 billion
C. 25 quadrillion
D. 25 gazillion

16. What kind of simple machine is ‘Jack’ which is used, while removing a punctured wheel?
A. Pulley
B. Inclined plane
C. Lever
D. Wedge

17. A method of growing plants without soil is called __________.
A. Hydroponics
B. Horticulture
C. Agriculture
D. Aquaculture

18. Sound waves in the air are ___________.
A. Transverse
B. Longitudinal
C. Electromagnetic
D. Polarized

19. Magnetism at the center of a bar magnet is ___________.
A. Minimum
B. Maximum
C. Zero
D. minimum or maximum

20. Sound of frequency below 20 Hz is called ____________.
A. Audio sounds
B. Infrasonic
C. Ultrasonic
D. Supersonics

21. In which part of the alimentary canal the food is churned?
A. Stomach
B. Small intestine
C. Large intestine
D. Liver

22. What sensory function do the ears provide other than hearing?
A. Smell
B. Balance
C. Temperature
D. Radiation

23. How many sweat glands does the average person have?
A. 260000
B. 2 million
C. 2.6 million
D. 260 million

24. The rarest blood group is __________.
A. O negative B.
B negative
C. AB positive
D. AB negative

25. The longest and largest bone in the human body is ___________.
A. Spinal Cord
B. Femur
C. Humerus
D. Fibul

-Team ScienceNow Digital

QUIZ ANSWERS 1. A; 2. B; 3. C; 4. D; 5. B; 6. C. Given 7 + 7/7 + 7 x 7 – 7 By using BODMAS rule, 7 + 1 + 7 x 7 – 7 = 8 + 49 – 7 = 57 – 7 = 50. Hence 7 + 7/7 + 7 x 7 – 7 = 50; 7. D. None of these; 8. B. 120; 9. D. 4; 10. C. 1:2; 11. B; 12. A; 13. C; 14. B; 15. B; 16. C; 17. A; 18. B; 19. C; 20. B; 21. A; 22. B; 23. C; 24. D; 25. B

Let’s Try some Trivia….

What is the loneliest of all physics concepts?

The singularity

What kind of chemical element hates to be a follower?

Lead

What can kill with only a thimble worth; yet is around you at all times?

Oxygen

What is the most uninteresting of all the periodic elements?

Boron

What did scientists say when they found 2 isotopes of Helium?

They said “HeHe”.

What period of time has the least weight?

A light year

What number do Nickel and Neon make when combined?

Nine (NI + NE)

Who eats a lot of iron without getting sick?

The rust.

What can be measured, but has no length, width or height?

The temperature.

What do chemists call a benzene ring with iron atoms replacing the carbon atoms?

A ferrous wheel

–Team ScienceNow Digital

Now get ready and Test Yourself….

 

 

1. The BrahMos Missile was developed by which country?
A. India
B. India & China
C. Russia
D. India & Russia

 

2. What is the purest form of Iron?
A. Wrought iron
B. Pig iron
C. Cast iron
D. None of the above

 

3. Which is the most abundant gas in the earth’s atmosphere?
A. Oxygen
B. Nitrogen
C. Methane
D. Hydrogen

 

4. Which type of plastics can be recycled?
A. Polyvinyl Chloride (PVC)
B. Styrofoam
C. Thermoplastics
D. All of the above

 

5. Which metal is a liquid at room temperature?
A. Mercury
B. Tin
C. Lead
D. Brass

 

6. Which gas is found in soda water?
A. Oxygen
B. Argon
C. Carbon dioxide
D. Helium

 

7. What is the speed of Earth around sun?
A. 60 km/sec
B. 90 km/sec
C. 10 km/sec
D. 30 km/sec

 

8. Splitting of light into its constituent colours is known as what?
A. Refraction
B. Dispersion
C. Frequency
D. Prism

 

9. Cotton fibres are made of ______.
A. Cellulose
B. Wax
C. Fur
D. Seeds

 

10. Which historical victory achieved by a Spacecraft got Mars on its First try?
A. Astrosat
B. Chandrayaan
C. Manglayaan
D. Aryabhata

 

11. Rate of growth of plant is measured by which instrument?
A. Barometer
B. Hygrometer
C. Udometer
D. Auxanometer

 

12. The Ozone layer lies in the _______.
A. Troposphere
B. Biosphere
C. Stratosphere
D. Mesosphere

 

13. Celsius and Fahrenheit show the same temperature at ______.
A. 40
B. 39
C. 37
D. 41

 

14. ‘White Revolution’ is related to what?
A. Cotton
B. Milk
C. Water
D. Ice

 

15. Hypertension is the term used for _______.
A. Increase in heart rate
B. Decrease in heart rate
C. Decrease in blood pressure
D. Increase in blood pressure

 

16. What is the physical phase of life called?
A. Protoplasm
B. Cytoplasm
C. Organelles
D. None of the above

 

17. Which among the following was first human-made plastic?
A. Bakelite
B. Polyethene
C. Celluloid
D. Nylon

 

18. Amalgam’ is a term used for an alloy of a metal with ______.
A. Copper
B. Mercury
C. Lead
D. Aluminium

 

19. Which is the largest blood vessel in the body?
A. Alveoli
B. Artery
C. Vein
D. Aorta

 

20. The first synthetic fibre made by man was ______.
A. Nylon
B. Terycott
C. Polyester
D. Rayon

21. Which of the below is water soluble vitamin?
A. Vitamin C
B. Niacin
C. Riboflavin
D. All of the above

 

22. Radio Carbon Dating is use to estimate the age of ______.
A. Monuments
B. Fossils
C. Rocks
D. Soil

 

23. The fastest growing plant is ______.
A. Ashoka
B. Banyan
C. Eucalyptus
D. Coconut

 

24. Energy is measured in units called ______.
A. Joules
B. Newton
C. Watts
D. Ohm/mtr

 

25. Ozone holes are more pronounced at the ______.
A. Tropic of cancer
B. Poles
C. Equator
D. Tropic of Capricorn

 

-Team ScienceNow

 

Answers

 

1 D, 2 A, 3 B, 4 C, 5 A, 6 C, 7 D, 8 B, 9 A, 10 C, 11 D, 12 C, 13 A

 

14 B, 15 D, 16 A, 17 C, 18 B, 19 D, 20 A, 21 D, 22B, 23 C, 24 A, 25 B

Understand the facts in Science which we often miss…

What’s the Colour of Mirror?

It’s actually green. A human eye can distinguish between 10 million different colours. But to identify the colour of mirror, whether it is white or silver is very difficult. Mirror reflects the colour that is seen in it. It reflects all the images in the exact opposite direction due to angle of reflection and distance. But every mirror absorbs a very tiny amount of light within the 510 nanometre range. So, as the spectrum of visible light is green, the colour of the mirror is technically little green.

Where Do Permanently Deleted Files Go in Computers?

Actually the computer doesn’t delete anything. When we delete a file, we just put it into a new address or a pointer on the hard disk where it is stored. Large files are stored in multiple locations. When we open a file, the hard drive follows the pointer to identify the data. Thus any file is never erased and is always physically present on the hard disk. The files can be retrieved using special software. The data can only be erased when the hard disk is destroyed.

Where is the Centre of Universe?

The universe started with a “Big Bang” about 13.7 billion years ago and it has been expanding ever since. The centre of this expansion is everywhere. No matter where you are in the universe, everything will seem to be expanding or moving away from you at the same rate. Everything looks the same in every direction. So, there’s no one particular centre of Universe, rather the Centre of Universe is everywhere.

Why does fish smell so strongly?

In order to maintain fluid balance, fishes must fill their cells with amino acids and amines to remain safe from the saltiness of seawater. Ocean fish have trimethylamine oxide (TMAO) for this purpose. However once the fish is killed and bacteria and fish enzymes convert TMAO into trimethylamine, it gives off the characteristic fishy odour.

Why do taste buds change over time?

As we age, our taste buds actually change. Most of what we think of as taste comes from our noses’ smell receptors. As we age, it gets harder for our body to replace those receptors when they die off. As a result, people in old age are sometimes less sensitive to taste and so they gravitate toward things that have stronger, more detectable flavours.

-Team ScienceNow