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MCB

  MCB stands for  a) miniature circuit board  b) miniature circuit band c) miniature circuit breaker d) miniature circuit blocker Ans: c
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RADIOACTIVITY

Q1: What is radioactivity? A:  The  phenomenon of spontaneous emission of alpha particle or beta particle and gamma rays  from an unstable nucleus is called radioactivity.   Q2: When does a nucleus  become unstable ? A: When the number of neutrons become much more than that of protons. Q3: Which part of the atom takes part in radioactivity ? A: Nucleus Q4: What happens to the radioactive behaviour of a radioactive sample if it is chemically oxidized ? A: The radioactive behaviour does not change. As oxidation is the chemical change, it does not affect the nuclear activity. Q5: How does the atomic number and mass number change if a radioactive nucleus releases one alpha particle ? A: Atomic number decreases by 2 and mass number decreases by 4 Q6: How does the atomic number and mass number change if a radioactive nucleus releases one beta particle? A: Atomic number increases by 1 and mass number does not change.
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PENDULUM ON MOON

Q. If a simple pendulum is taken to the moon from the earth without changing the length, what is the effect on it's time period? Ans: As the time period of a simple pendulum is inversely proportional to the square root of acceleration due to gravity and the acceleration due to gravity of the moon is less than that of the earth, time period increases (square root of 6 times)
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FORCE ON CURRENT CARRIYING CONDUCTOR

 Q: Why does a current carrying conductor placed in an magnetic field experiences force ? Ans: Moving charges experience force in magnetic field. So when a current carrying conductor is placed in the magnetic field,it experiences force due to the force on moving charges inside it. The formula F=IBLsin@, I= Current,  B =external magnetic field  L is the length of conductor inside the magnetic field. MAXIMUM FORCE When the  conductor is placed perpendicular to the magnetic field. MINIMUM FORCE When the conductor is placed parallel to the magnetic fields 
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SUBJECTIVE AND OBJECTIVE PROPERTIES OF A SOUND

 Question: What are subjective and objective properties of sound ? Answer : Subjective properties are basically the properties which can be measured directly. Loudness, pitch (shrillness) and quality(Timbre) of sound are subjective properties. But these properties  are related to the the measurable quantities  called objective properties.  Objective properties are the properties which can be measured. Intensity,  Amplitude, frequency, wavelength,  time period, intensity, fundamental frequency,  subsidiary frequencies are objective properties.  Loudness depends on amplitude,  intensity of the sound. Pitch(shrillness) depends on frequency. Quality (Timbre) depends on waveform( combination of primary and subsidiary notes).
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