Explanation

The condition of a fully charged lead-acid battery can be checked by:

Voltage: 2.1-2.2 volts per cell.

Gassing: Battery emits gas when fully charged.

Specific Gravity: 1.260-1.300 in the electrolyte.

Explanation

Sir Dinsha was the father of Ratna, who was later became known as the wife of Muhammad Ali Jinnah.

He was a prominent Parsi community leader and philanthropist.

Explanation

The Khilafat movement (1919–22) was a political campaign launched by Indian Muslims.

The 'Khilafat Movement Day' was observed on 17th October 1919. 

Explanation

The AND gate represents a series gate.

It only outputs a high signal when all its inputs are high.

Similar to a series connection where current flows only if all conditions are met.

Explanation

SCR (Silicon Controlled Rectifier) is a four-layer device.

It consists of four layers of semiconductor material arranged as alternately P-type and N-type layers.

Explanation

 A DIAC is a full-wave or bi-directional semiconductor switch that can be turned on in both forward and reverse polarities.

Explanation

The Battle of Tabuk, also known as Ghazwa e Tabuk.

was the last military expedition led by Muhammad before his death in 632.

According to al-Mas'udi, the Prophet (s)'s ghazwas were 26, but some people took their number to be 27. 

Prophet ( ﷺ) set out for Tabuk, appointing Ali al-Murtaza as his caliph to administer Madinah.

According to Rajab 9 AH, the Holy Prophet ( ﷺ) embarked on this journey on Thursday, 630 AD, according to all historians.

Explanation

UJT (Uni-Junction Transistor) has negative resistance.

This characteristic allows it to be used in oscillators and timing circuits.

Explanation

A wattmeter is an electrical instrument which is used to measure the electric power (in watts) of any electrical circuit.

**Additional Information**

Voltmeter – is used to measure the electric potential difference between two points,

Wavemeter – is used to measure the wavelength of a radio wave,

Viscometer – is used to measure the viscosity of the liquid.

Explanation

A marriage is dissolved if either the husband or wife becomes deceased.

This event legally terminates the marital union.