Electricity Tes...

Three unequal resistors in parallel are equivalent to a resistance of 1 ohm. If two of them are in the ratio of 1 : 2 and if no resistance value is fractional (let them be natural numbers), the smallest of the three resistances (in ohms) is
[NTSE - Stage - 1, 2018-19, Andhra Pradesh]

Then r =
[NTSE – Stage – 1, 2018-19, Andhra Pradesh]

The identical (in all aspects) metal spheres A, B and C are supported on separate insulated stands and placed in contact as shown in the figure. A charged glass rod rubbed by a silk cloth is kept near the metal sphere A; then charges on A, B and C respectively are:


[NTSE - Stage - 1, 2018-19, Andhra Pradesh]

A solid cube of silver has a mass of 84 g. What is the resistance between the opposite faces, given that density of silver is 10.5 g/cm³ and resistivity is 1.6 × 10^-4 Ω cm?
[NTSE - Stage - 1, 2018-19, Chandigarh]

The equivalent resistance of the network of three 2 Ω resistors cannot be
[NTSE - Stage - 1, 2018-19, Chandigarh]

A bird is in a wire cage hanging from a spring balance. The reading of the balance is taken when the bird is flying about in the cage, and when the bird is at rest in the cage. The first reading will be:
[NTSE - Stage - 1, 2018-19, Chandigarh]

Electric bulb B₁ (1000 W - 250 V) and electric bulb B₂ (100 W - 200 V) are connected across a source of 250 V as shown in figure. What is the potential drop across electric bulb B₂?


[NTSE - Stage - 1, 2018-19, Chandigarh]

Determine the equivalent resistance between points x and y in the following circuit.


[NTSE - Stage - 1, 2018-19, Gujarat]

Which formula is not correct for R? (R = Resistance)
[NTSE - Stage - 1, 2018-19, Gujarat]

The unit of electric potential difference is
[NTSE - Stage - 1, 2018-19, Gujarat]

The current in the circuit shown below is


[NTSE - Stage - 1, 2018-19, Karnataka]

A wire of resistance 12 ohms is bent in the form of a circular ring. The effective resistance between the two points on any diameter of the circle is
[NTSE - Stage - 1, 2018-19, Karnataka]

The graph shows V-I characteristics of two resistances, their series combination and parallel combination. Identify the resistances, values and graphs.


[NTSE - Stage - 1, 2018-19, Haryana]

In the circuit shown, all the measuring instruments are ideal. The reading in ammeter A₂ will be


[NTSE - Stage – 1, 2018-19, Haryana]

In a helium gas discharge tube, every second, 40 × 10¹⁸ He⁺ ions move towards the right through a cross-section of the tube, while n electrons move to the left in the same time. If the current in the tube is 8 A towards right, then n = ?
[NTSE - Stage - 1, 2018-19, Maharashtra]

Conductivity of superconductors is:
[NTSE - Stage - 1, 2018-19, Madhya Pradesh]

The value of 1 kWH in joules is
[NTSE - Stage - 1, 2018-19, Telangana]

If the resistance of your body is 1,00,000 Ω, what would be the current that flows in your body when you touch the terminals of a 12 V battery?
[NTSE - Stage - 1, 2018-19, Telangana]