Related Questions

A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
A From brown to blue-black
B From brown to orange-red
C From blue to pink
D From pink to blue-green
A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be
A Same
B Double
C Half
D One-fourth
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be
A Same
B Double
C One-half
D One-fourth
একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)
A তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)
B তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)
C তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)
D তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
A Decreases
B Increases
C Remains same
D First increases and then decreases depending on the depth of iron in¬sertion
Aruna cut a cake into two halves and cuts one half into smaller pieces of equal size. Each of the small pieces is twenty grams in weight. If she has seven pieces of the cake in all with her, how heavy was the original cake ?
A 120 grams
B 140 grams
C 240 grams
D 280 grams
E None of these
When two springs are in series (having stiffness K), the equivalent stiffness will be
A K
B $$\frac{{\text{K}}}{2}$$
C 2K
D $$\frac{{\text{K}}}{4}$$
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
A Increase
B Decrease
C Remain the same
D Initially increase and then decrease
If a spring is cut down into two springs, the stiffness of cut springs will be
A Half
B Same
C Double
D None of the above
A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area?
A 289
B 361.5
C 481.25
D 962.5

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