Electrical resistivity of a given metallic wire depends upon
(a) its length
(b) its thickness
(c) its shape
(d) nature of the material
In the following circuits Figure, heat produced in the resistor or combination of resistors connected to a 12 V battery will be
(a) same in all the cases
(b) minimum in case (i)
(c) maximum in case (ii)
(d) maximum in case (iii)
A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be
(a) maximum in (i) (b) maximum in (ii)(c) maximum in (iii)(d) the same in all the cases
How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?
Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of deviation.
When do we consider a person to be myopic or hypermetropic? Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected?
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
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