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The temperature coefficient of resistance of a semiconductor
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(a) Is always positive |
(b) Is always negative |
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(c) Is zero |
(d) May be positive or negative or zero |
A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:
The nucleus 
splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are
(a) 
|
(b) 
|
(c) 
|
(d) 
|
An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of
|
(a) 4R |
(b) R/4 |
(c) R/16 |
(d) 16R |
In 
nucleus, there are
|
(a) 138 protons and 88 neutrons |
(b) 138 neutrons and 88 protons |
|
(c) 226 protons and 88 electrons |
(d) 226 neutrons and 138 electrons |
When the momentum of a proton is changed by an amount P0, the corresponding change in the de-Broglie wavelength is found to be 0.25%. Then, the original momentum of the proton was
|
(a) p0 |
(b) 100 p0 |
(c) 400 p0 |
(d) 4 p0 |