Questions asked by sweety

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Explain the use of capacitor in time delay circuits?What is its definition? I don want to go deep into it Just keep it simple Please just for a 10 class student
Ionic equation between copper carbonate and sulphuric acid question is that whether copper carbonate dissociates into its ions or not.According to me,it does not but in some papers I have seen that it dissociated into CO^-2 3.Explain?
A fair five sided spinner is numbered 1,3,5,7 and 9.Katrina spins it three times.Calculate probabilty that three numbers are the same.correct answer is 1/25?i solved it by multiplying 1÷5 three times as each time it probability is 1÷5.
A student has box which contains 10 similar straws,30cm ruler and 2 set squares.Explain to determine average value for diameter of 1 straw?
Sodium reaction with Iodine(1) chloride.What is equation?my answer was 2Na+2ICl》2NaCl+I2.But it is incorrect.Correct answer is 2Na+ICl》NaCl+NaI How?
Carbon-14 decays by beta emission to stable isotope of nitrogen. Carbon-14 half-life of 5700 years(i) A pure sample of carbon-14 initially contains 8.0 × 1020 atoms. Calculate number of atoms of carbon and of nitrogen present in sample after 11 400 years?
Which of these processes can be used to purify water containing insoluble impurities ? 1.chlorination 2.desalination 3.distillation 4.filtration (a)1 and 2 (b)2 and 3 (c)3and 4 (d)4?
Which ions are present when hydrochloric acid has exactly neutralized aqueos sodium hydroxide?(A )Na+,Cl-,H+ and OH- (b) Na +,Cl- and H+ (C) Na + and OH- (D)H+ and OH- Why is it A? DONT KNOW TELL ME.
28 A girl is long-sighted. Which statement is correct? A She sees close objects less clearly than a person with normal vision. B She sees distant objects more clearly than a person with normal vision.
The 1500 Ω resistor on electronic circuit board has correct power rating of 0.25 W.State disadvantage of using different 1500 Ω resistor with power rating that is (1)much less than 0.25 W? (2)much greater than 0.25 W?