Friday, February 28, 2020
04:22 AM (GMT +5)

 CSS Forums Every Day science Paper 2010
 User Name Remember Me? Password

#11
Monday, March 08, 2010
 Senior Member Join Date: Oct 2007 Location: Sargodha Posts: 420 Thanks: 380 Thanked 448 Times in 216 Posts

what is meant by expenditure of energy? aircraft which u mentioned will consume solar energy.it can fly forever only if it continues to expend solar energy.
__________________
The color of blood in my veins is green,I am a proud Pakistani.
 The Following User Says Thank You to The Star For This Useful Post: Zahara Alvi (Thursday, January 27, 2011)
#12
Monday, March 08, 2010
 Junior Member Join Date: Apr 2009 Posts: 9 Thanks: 0 Thanked 17 Times in 6 Posts

Heat can be transmitted by radiation (heat waves across empty space), convection (flow in air or liquids by mixing of molecules and hot air rising), and conduction ( flow through a solid).

So the best answer is Radiation for MCQ 1
#13
Monday, March 08, 2010
 Senior Member Join Date: Jun 2006 Location: Rawalpindi Posts: 97 Thanks: 9 Thanked 58 Times in 20 Posts

I chose IN DUE TIME, the question mentioned, expenditure, expenditure refers to continued use of energy, which is only possible if the object is working against some forces, if forces are removed, the machine can keep working with the initial energy given to it, like a push to a pendulum.
__________________
"When He decreeth a matter, He saith to it: "Be," and it is."
#14
Monday, March 08, 2010
 Junior Member Join Date: Apr 2009 Posts: 9 Thanks: 0 Thanked 17 Times in 6 Posts

Quote:
 Originally Posted by The Star what is meant by expenditure of energy? aircraft which u mentioned will consume solar energy.it can fly forever only if it continues to expend solar energy.
Sorry I got the question wrong....your argument looks valid!!!
#15
Monday, March 08, 2010
 Senior Member Join Date: Dec 2009 Location: Islamabad Posts: 351 Thanks: 219 Thanked 222 Times in 143 Posts

19. Cusec is a unit of :

a) Area
b) Time
c) Distance
d) mass
e) None of these

Cusec is a measure of flow rate and is informal shorthand for cubic feet per second (28.317 litres per second). In the United States it is generally applied to water flow, particularly in rivers. Other informal synonyms are cfs and second-feet.
1 ft3s-1 = 0.028316847m3s-1 1 ft3s-1 = 1 cusec
1 ft3s-1 = 28.316847 litre s-1 1 cubic foot per minute = 1 cufm
1 cufm = 1.699m3h-1 1 cufm = 28.32 litre min-1
1 gallon per minute = 0.7577 litre s-1 1 gallon per minute = 7.577x10-5m3s-1

Source: http://en.wikipedia.org/wiki/Cusec
__________________
"The only necessary thing for the triumph of evil is for good men to do nothing."
--Edmund Burke (1729-1797)
 The Following User Says Thank You to Arbab.Danish For This Useful Post: goswamiraaj (Tuesday, October 05, 2010)
#16
Tuesday, March 09, 2010
 38th CTP (FSP) Join Date: Jan 2010 Posts: 105 Thanks: 104 Thanked 56 Times in 40 Posts

1) STP: Standard Temperature and Pressure
2) LORAN: Long Range Navigation
3) SONAR: Sound Navigation and Ranging
4) MAF: Million Acre Feet
5) MeV: Million Electron Volt, Mega electron Volt
6) MASER: Microwave Amplification By Stimulated Emission of Radiation
7) AWACS: Airborne Warning and Controlling System
8) CCTV : Closed Circuit Tele Vision
 The Following User Says Thank You to irshadsod For This Useful Post: kashifilyas (Tuesday, March 09, 2010)
#17
Tuesday, March 09, 2010
 Junior Member Join Date: Feb 2010 Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts

MCQ
3. answer is (e) none of theses

rain fall is measured through rain gauge (ref wikipedia)

20. deepest place on eath is (b) marina tench It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres (1,580 mi) long but has a mean width of only 69 kilometres (43 mi). (ref wikipedia)

MCQ
No. 27 answer is (a) Current

GM :A galvanometer is a type of ammeter: an instrument for detecting and measuring electric current.

MCQ of GK-II (correction needed)

1. (a)
2. (c)
3. (b)
4. (b)
5. (b)
6.(a)
7.(a)
8.(c)
9. (c)
10. (a)
11.( c)
12.(b)
13. (c)
14.(a)
15.(c)
16.(c)
17.(b)
18.(a)

Last edited by Princess Royal; Tuesday, March 09, 2010 at 05:36 AM.
#18
Tuesday, March 09, 2010
 Senior Member Join Date: Sep 2009 Location: R.I.P(Rest In Peace) Posts: 743 Thanks: 0 Thanked 1,143 Times in 374 Posts

GM counter is used for radiation
GM counter is Gieger-muller counter

__________________
Reality is something you rise above.
#19
Tuesday, March 09, 2010
 Senior Member Join Date: Nov 2009 Location: Karachi Posts: 857 Thanks: 333 Thanked 486 Times in 320 Posts
to salal

@salal

Dear what ever work is done is needs energy.
needs energy implies to theexpenditure of energy
so prototype air craft or any other scientific inventions what so ever works expend the energy.
the machine you are reffering to i charges its solar cell means it gains energy and works using and expending that energy it keeps on charging and expending energy for doing some work.

do dear it is quite imposible to work without expenditure of the energy

regards
#20
Tuesday, March 09, 2010
 Junior Member Join Date: Jul 2009 Location: Peshawar Posts: 9 Thanks: 2 Thanked 0 Times in 0 Posts

2. A time can come when we will be able to design a machine which can go on working for ever without the expenditure of energy. Is it possible ?

a) No
b) Yes
c) In due course time
d) Very soon
e) None of these

D and C can be omitted straightaway because we can not say anything about these two options presently.

B: well, one of the basics of mechanics is that to be able to do work, energy must be spent. So this can not be the answer.

A: Umm, what if the basic laws of mechanics change in future? Theories once widely accepted and acknowledged were rejected later on: e.g; Earth's orbital motion etc

E: None of these; might be a democratic answer.. I would have gone with these one, just like we get the polls on geo which has three options:

Han.
Na
Pata nahi

This is the trickiest question of the paper, i would like to see more comments on this one.