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Electricity

A cylindrical conductor of length l and uniform area of crosssection A has resistance R. Another conductor of length 2l and
resistance R of the same material has area of cross section
(a) A/2
(b) 3A/2
(c) 2A
(d) 3A

07/11/2024

Science

10th

Electricity

The proper representation of series combination of cells (Figure) obtaining maximum potential is

(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)

07/11/2024

Science

10th

Electricity

What is the minimum resistance which can be made using five resistors each of 1/5 Ω?
(a) 1/5 Ω
(b) 1/25 Ω
(c) 1/10 Ω
(d) 25 Ω

07/11/2024

Science

10th

Electricity

What is the maximum resistance which can be made using five resistors each of 1/5 Ω?
(a) 1/5 Ω
(b) 10 Ω
(c) 5 Ω
(d) 1 Ω

07/11/2024

Science

10th

Electricity

Identify the circuit Figure in which the electrical components have been properly connected.

(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)

07/11/2024

Science

10th

Electricity

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
(a) 1020
(b) 1016
(c) 1018
(d) 1023

07/11/2024

Science

10th

Electricity

Electrical resistivity of a given metallic wire depends upon
(a) its length
(b) its thickness
(c) its shape
(d) nature of the material

07/11/2024

Science

10th

Electricity

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)

07/11/2024

Science

10th

Electricity

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

07/11/2024

Science

10th

The Human Eye and the Colourful World

How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?

07/11/2024

Science

10th