A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor. The current in the circuit is 0.5 A. The terminal voltage of the battery when the circuit is closed […]
If an electron and a positron annihilate, the energy released is
Options
(a) 3.2×10⁻¹³ J (b) 1.6×10⁻¹³ J (c) 4.8×10⁻¹³ J (d) 6.4×10⁻¹³ J
Correct Answer:
1.6×10⁻¹³ J
Explanation:
No explanation available. Be […]
A nucleus at rest splits into two nuclear parts having radii in the ratio 1:2. Their velocities are in the ratio
Options
(a) (4:1) (b) (8:1) (c) (2:1) (d) (6:1)
Correct Answer:
(8:1)
A series combination of resistor (R), capacitor (C), is connected to an AC source of angular frequency ω. Keeping the voltage same, if the frequency is changed to ω/3, the current becomes half of the […]
Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I would be
Options
(a) [ML²T⁻²] (b) [ML²T⁻¹I⁻¹] (c) [ML²T⁻³I⁻²] […]
Dimensional formula of magnetic field in terms of mass M, length L, time T and Charge Q is
Options
(a) MT²Q (b) MT²Q⁻¹ (c) MT⁻¹Q⁻¹ (d) MT⁻³Q⁻¹
Correct Answer:
MT⁻¹Q⁻¹
Explanation:
No explanation […]
The height of the dam, in an hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water (in Kg) that must fall per second on the […]
A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is
Options
An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed that two successive nodes are formed at distances 16 cm and 46 cm from the open end. The speed of […]
Velocities of sound measured in hydrogen and oxygen gas at a given temperature will be in the ratio
Options
(a) (1:4) (b) (4:1) (c) (2:1) (d) (1:1)
Correct Answer:
(4:1)
Explanation:
No explanation […]
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