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  1. A

    Biology; Chemistry; Physics: Post your doubts here!

    When one radium nucleus decays, its mass decreases by 8.8 × 10–30 kg. How much energy is equivalent to this loss in mass? (speed of light c = 3.0 × 108 m/s) A 6.8 × 10–42 J B 2.6 × 10–21 J C 4.0 × 10–13 J D 7.9 × 10–13 J
  2. A

    Biology; Chemistry; Physics: Post your doubts here!

    kya app ke pass notes hain... is topic se related.. like which one is better to use like .. thin bulb aur thicker one?
  3. A

    Biology; Chemistry; Physics: Post your doubts here!

    under which topic the sensitivity of thermometer is covered?
  4. A

    Biology; Chemistry; Physics: Post your doubts here!

    i was referring to the wrong marking scheme :P
  5. A

    Biology; Chemistry; Physics: Post your doubts here!

    hahaha yes it is :D my bad :P
  6. A

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/5054_w12_qp_11.pdf please do question no. 9 for me..
  7. A

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/5054_w12_qp_11.pdf question no.7 why the answer is not C.. 400*12=4800 and 300*16=4800
  8. A

    Biology; Chemistry; Physics: Post your doubts here!

    400 ko 8 se kiu divide kiya??
  9. A

    Biology; Chemistry; Physics: Post your doubts here!

    0 The background count rate in a laboratory is 10 counts/min. The measured count rate from a radioactive source is 410 counts/min, which includes the background. The half-life of the source is 5 days. What is the measured count rate after 15 days? A 10 counts/min B 50 counts/min C 60...
  10. A

    Pakistan Studies, Islamiyat and Urdu: Post your doubts here!

    kiu :P urdu mai grade acha nahi ata :P ?
  11. A

    Maths, Addmaths and Statistics: Post your doubts here!

    can anyone please explain me the concept pf upper and lower bound....!!! please
  12. A

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/5054_s10_qp_12.pdf why not C in question no. 11
  13. A

    Biology; Chemistry; Physics: Post your doubts here!

    ca any one expain me how velocity become negative?
  14. A

    Biology; Chemistry; Physics: Post your doubts here!

    Thank you sooo muchh!! these are reallllyyy Good!!!
  15. A

    Biology; Chemistry; Physics: Post your doubts here!

    kya kisi ke pas Phy ke notes hain.. covering all the topics.?? please share with me
  16. A

    Biology; Chemistry; Physics: Post your doubts here!

    please help me in Phy... i have done 2 Mcqs paper and got 31 , 30.. :cry:
  17. A

    Chemistry P1 and P2 today

  18. A

    Chemistry P1 and P2 today

    there was another question.. mujhe yaad nahi raha. lekin it was about i mol of hydrocarbon reacts with oxygen to form C02 and H2O (complete combustion).. which compound would react with least amount of oxygen??
  19. A

    Chemistry P1 and P2 today

    No.. :/ im sorry
  20. A

    Chemistry P1 and P2 today

    there was MCq related to exothermic graph.. and the question was what whould pe the reaction in reverse reaction.. i did the option endothermic and positive symbol...
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