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375 results found with an empty search
- Radioactivity - Questions on Penetrating Ability and Applications
2002PPQ38, 2003PPQ38, 2005PPQ37, 2006PPQ38, 2007PPQ39 Answer: Option B Answer: Option D Answer: Option B Answer: Option C Answer: Option B Answer: Option A Answer: Option C Answer: Option B Answer: Option D
- Radioactivity - Questions on mass number and proton number of the nucleus after decay
2005SPQ20, 2006PPQ40, 2005PPQ38, 2003PPQ39 Answer: Option A Answer: Option D Answer: Option B Answer: Option C Answer: Option B Answer: Option B
- Radioactivity - Questions on emissions through electric and magnetic field
Alpha particle is a helium nucleus which is positive charged . Beta particle is an electron which is negative charged . Gamma ray has no charge. Charged particle will be deflected by electric field by laws of electrostatic (like charges repel and unlike charges attract. Charged particle will be deflected by magnetic field and you can determine the direction using FLHR . (Note that beta is negative charge, it is like electron flow which is opposite to convectional current.) Watch the view to revise. Questions: 2007PPP1Q39, 2004PPP1Q37 Answer: Option D Answer: Option B Answer: Option B Answer: Option A Answer: Option D
- Radioactivity - Questions on Half-life
Half-life of a radioactive nuclide is the time taken for half the nuclei of that nuclide in any sample to decay . (time taken for the count rate/mass/nuclei/atoms to fall to half of its original value) Quick revision on half-life. 2002SPP1Q19, 2003SPP1Q19, 2006SPP1Q20, 2004SPp1Q19 Questions: Answer: Option C Answer: Option C Answer: Option C Answer: Option C Answer: Option D Answer: Option C Answer: Option C Answer: Option B Answer: Option D Answer: Option D
- Copper spheres P and Q, P has larger volume. What quantity is the same? 2020PP01q7
This question is very straight forward. As both P and Q are copper, the density will be the same. But many are unsure of KE. Let look at how to prove that KE is different. Answer: Option A
- What happens to frequency and speed of water wave as it goes to shallow region? 2019PPp1q23
Once the wave is produced, the frequency remains constant. Hence speed V of the wave is directly proportional to the wavelength of the wave. Answer: Option C
- What is the resistance of Y when its length is doubled and diameter three times larger? 2018PPp1q31
When question states that radius or diameter is increased by 3 times, that note that cross-sectional area does not increase by 3 times. It increases by 9 times due to the square. Refer to this question to learn the concetps. Answer: Option A
- Factors that affect the resistance of a conductor
In general, assuming temperature of a conductor is constant, the resistance of a conductor is affected by 1) length (L) – [L increases, R increases] 2) cross-sectional area (A) – [A increases, R decreases] 3) resistivity (p) = [p increases, R increases] As R is directly proportional to L and p, and is inversely proportional to A, R = pL/A MCQ questions from Olevel When radius or diameter is three times larger, cross-sectional area does not increase by three times!! Refer to this example: 2018PPp1q31 There are times when using the formula is more appropriate.
- 2013SPp1q17 What is the new P when V across resistor is doubled? Similar 2018PPp1q31
Answer: Option C View the videos below to learn how to solve it. There are more than one method. Alternatively, you may put values to work out using the 2 basic formulae of P = IV and V = IR. Refer the video below. Similar question 2018PPp1q35 Answer: Option D
