## Tuesday, 4 August 2015

### Mathematical puzzle

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

## Sunday, 8 March 2015

### Confusing Lost Chocolates Puzzle

Alex bought 150 chocolates but he misplaced some of them. His mother asked him how many chocolates were misplaced and he gave the following answer to her:
If you count in pairs, one remain
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remain.

Can you analyze the statements and tell us how many chocolates were lost?

## Wednesday, 15 January 2014

### Science Mcqs

1. The Sun is a __________.
1. Star
2. Planet
3. Asteroid
4. Meteor

2. The average adult has a blood volume of about __________ liters.
1. 4
2. 5
3. 6
4. 7

3. The most abundant element in the universe is __________.
1. Oxygen
2. Hydrogen
3. Carbon Dioxide
4. Silicon

4. The most abundant element in the Earth's crust is __________.
1. Oxygen
2. Hydrogen
3. Carbon Dioxide
4. Silicon

5. Each day human body breathe in __________ liters of air.
1. 5,000 to 10,000
2. 10,000 to 15,000
3. 15,000 to 20,000
4. 20,000 to 25,000

6. Deficiency of Vitamin-D results in __________.
1. night blindness
2. rickets
3. scurvy
4. hair fall

7. The SI unit of "pressure" is _________.
1. pascal
2. joule
3. tesla
4. henry

8. The most densest substance on the Earth is __________.
1. Platinum
2. Copper
3. Steel
4. Osmium

9. A camera uses a __________ to form an image.
1. convex lens
2. concave lens
3. condenser lens
4. none of these

10. Which from the following is NOT a conductor?
1. Aluminium
2. Silicon
3. Graphite
4. All are conductors
11. A
12. B
13. B
14. A
15. C
16. B
17. A
18. D
19. A
20. D

### Everyday Science MCQs

1. Which is the outermost planet in the solar system?
1. Mercury
2. Pluto
3. Neptune
4. Uranus

2. The SI unit of charge is __________.
1. Ampere
2. Coulomb
3. Ohm
4. Volt

3. Very High Frequency (VHF) have __________ wavelengths.
1. shorter
2. shortest
3. longer
4. longest

4. Long-sight defect could be corrected by using __________ lens.
1. concave
2. vonvex
3. diverging
4. none of these

5. Deficiency of Vitamin-A results in __________.
1. night blindness
2. rickets
3. scurvy
4. hair fall

6. For a fixed mass of gass at constant temperature, if we decrease volume, the pressure will _________.
1. also decrease
2. increase
3. remains constant
4. none of these

7. The lifespan of Red Blood Cells is __________ days.
1. 60
2. 120
3. 180
4. 240

8. The density of water is __________.
1. 1 g/cm3
2. 1.5 g/cm3
3. 2 g/cm3
4. none of these

9. Radioactivity was discovered by __________.
1. Kelvin
2. Thomson
3. Rutherford
4. Bacquerel

10. A device which converts chemical energy into electrical energy is called __________.
1. motor
2. generator
3. moving-coil meter
4. battery
01. C
02. B
03. A
04. B
05. A
06. B
07. B
08. A
09. D
10. D

### New year death puzzle

A man drive his car to the office at 20miles/hr. After reaching office, he realize that its a new year holiday so he went back home at a speed of 30miles/hr. Discounting the time spent in the stoppage what was his average speed of his journey ?