Related Questions

In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
A bad, good
B bad, bad
C good, bad
D good, good
'My father is a down to earth man.' Here the expression 'down to earth' means-
A angry and insensitive
B undecisive and cruel
C sad and pathetic
D sensible and practical
পৃথিবী পৃষ্ঠে একটি ইটের ওজন 81 N. পৃথিবীর অর্ধেক বাসার্ধের সমান উচ্চতায় এবং অর্ধেক বাসার্ধের সমান গভীরতায় ইউটির উপরে পৃথিবীর অভিকর্ষ বলের মান কত হবে?(A brick weighs 81 N on the surface of the earth. What are the earth's gravitational forces act on it at a height of half of the radius of the earth and at a depth of half of the radius of earth, respectively?)
A 36 N and 81 N
B 36 N and 40.5 N
C 36 N and 20.25 N
D 98 and 40.5 N
E 81 N and 81 N
When an electric bulb breaks, there is an explosive sound. That is due to
A The chemical reaction between the gases inside the bulb
B The compressed gases inside rushing out suddenly
C The air outside rushing in to fill the vacuum inside the bulb
D None of these
Which is NOT an example of organism that breaks down the food material outside the body and then absorb it?
A Bread moulds
B Yeast
C Mushrooms
D Snake
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by
A Blv
B Blv2
C Bl2v
D Bl2v2
Resistance of an electrical conductor is proportional to its (where, L = length and A = cross-sectional area of the conductor)
A A
B L
C A2
D Both A & B
Which of the following is a good conductor of heat but bad conductor of electricity ?
A Asbestos
B Celluloid
C Straw Board
D Mica
Which of the following is an advantage of stranded conductor over equivalent single conductor ?
A Less liability to kink
B Greater flexibility
C Less liability to break
D All of the above
Which of the following is a good conductor of heat but a bad conductor of electricity ?
A Celluloid
B Rubber
C Asbestos
D Mica

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