**Category** > **General Science MCQs for WBCS**

- A picometer is a unit of measurement of length. A picometer (pm) is a derived metric measurement unit of length. The metric unit prefix pico means one trillionth, or one (1) with eleven (11) nulls in front of it, i.e. 0.000,000,000,001 or 1×10
^{-12}. That makes one picometer equal to one trillionth of a meter. - Hygrometer, an instrument used in meteorological science to measure the humidity or amount of water vapor in the air.
- A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
- A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object).

Q 1. √732108 = ?

Q 2. Which is the smallest 5-digit number which can be completely divided by 98?

Q 3. If 8 men can sow 80 hectares in 24 days, then how many hectares can 36 men sow in 30 days?

Q 4. The LCM of two numbers is 2310 and HCF is 30. If one of the numbers is 210, then what is the other number?

Q 5. In a 30 litre mixture of milk and water, the ratio of milk and water is 7:3. How much water should be added in the mixture so that the ratio of milk and water becomes 3:7?

Q 6. A and B can together do a work in 6 days. A can do it alone in 9 days. In how many days can B do it alone?

Q 7. The average marks obtained by 120 students in an exam is 35. If the average marks obtained by successful students is 39 and the average marks obtained by unsuccessful students is 15 then what is the number of successful students?

Q 8. A train travels from A to B at the speed of 20 km./hr. and from B to A at the speed of 30 km./hr. Then what is the average speed of train in km./hr.?

Q 9. There is a loss of 12 percent on an article being sold for Rs. 352.88, then the cost price of the article is

Q 10. National Income estimates in India are prepared by