Related Questions

Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called
A flavoxanthin
B melanin
C carotene
D Xanthophyll
একটি কণা t = 0 সময়ে স্থির অবস্থা থেকে যাত্রা শুরু করে। কণাটির ওপর প্রযুক্ত লব্ধি বল, সময় t এর সমানুপাতিক। কণাটির গতিশক্তি নিচের কোনটির সমানুপাতিক হবে? (A particle starts from rest at t = 0. The net force acting on the particle is proportional to time t. Its kinetic energy is proportional to which one of the following?)
A t2
B t3
C t
D t4
The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
A Lewis-Randall rule
B Statement of Vant-Hoff equation
C Le-Chatelier's principle
D None of these
If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?
A $$\left( {A + B} \right)\alpha \,C$$
B $$\left( {A - B} \right)\alpha \,\frac{1}{C}$$
C $$\sqrt {AB} \,\alpha \,C$$
D $$\frac{A}{B} = {\text{constant}}$$
Owing to skin effect
A Current flows through the half cross-section of the conductor
B Portion of the conductor near the surface carries more current and core of the conductor carries less current
C Portion of the conductor near the surface carries less current and core of the conductor carries more current
D Any of the above
The skin effect of a conductor will reduce as the
A Resistivity of conductor material increases
B Permeability of conductor material increases
C Diameter increases
D Frequency increases
On which of the following factors skin effect depends?
A Frequency of the current
B Size of the conductor
C Resistivity of the conductor material
D All of the above
Skin effect occurs when a conductor carries current at _________ frequencies.
A Very low
B Low
C Medium
D High
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
A Arc
B Resistance
C Low frequency induction
D High frequency induction
লাইনে ফ্রিকুয়েন্সি বাড়লে 'Skin effect' কি হয়?
A বৃদ্ধি পায় 
B হ্রাস পায়
C অপরিবর্তিত থাকে
D কোনোটিই নয়

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