RRB ALP GK Questions 2026

Pitch is how shrill or how flat a sound seems to the ear, and it is decided by frequency, the number of vibrations per second measured in hertz.

The first equation of motion is written as v equals u plus a t, so it tells how the velocity of a body changes with time.

An echo is the sound heard when a wave is reflected from a distant obstacle and comes back, so in the time measured the sound covers the distance to the cliff and then the same distance back again.

The force on a current-carrying conductor placed in a magnetic field is found with Fleming's left-hand rule.

Electrical energy is power multiplied by time, so the unit follows directly from the units you put in. The oven is rated 2500 W, which is 2500 divided by 1000, that is 2.5 kilowatts.

Power is the work done divided by the time taken, and here the work is the potential energy the boy gains while climbing the staircase.

A microphone is a transducer: sound waves strike a thin diaphragm, the diaphragm vibrates, and that mechanical vibration is turned into a varying electric signal.

Fires are grouped by what is burning, and Class D covers burning metals such as magnesium, sodium, potassium, titanium and aluminium powder.

The Freedom Trail is a 2.5-mile red brick path laid out in Boston, Massachusetts, in 1951, linking sixteen sites connected with the American Revolution.

Green plants use sunlight trapped by chlorophyll to join carbon dioxide and water, and the balanced equation reads six molecules of carbon dioxide plus twelve of water giving one molecule of glucose, six of oxygen and six of water.

Heating a liquid makes its molecules move faster and sit a little further apart, so the attraction between them weakens, and both properties depend on that attraction.

Germanium is not used to build light emitting diodes because it is an indirect band gap semiconductor, so an electron falling back across the gap gives up most of its energy as heat in the crystal rather than as light.

This is the statement that is not correct, because water has a much higher surface tension than ethyl alcohol.

Pressure counted from a perfect vacuum as the zero point is called absolute pressure. A perfect vacuum holds no gas and exerts no pressure, so it is the true zero of any pressure scale.

The Orient Express ran from Paris in France to Istanbul in Turkey, crossing Strasbourg, Munich, Vienna, Budapest, Belgrade and Sofia, so almost the whole of its roughly 3,000 km line lay inside Europe.

An ocean thermal energy conversion plant works only where the warm surface water is at least about 20 degrees Celsius hotter than the cold water drawn from the depths.

Collenchyma cells lay down extra cellulose and pectin at the corners of their walls, which makes the tissue strong and yet flexible.

India allows 100 per cent foreign direct investment through the automatic route in the construction, operation and maintenance of rail infrastructure projects.

Green plants give out oxygen only during photosynthesis, the process in which they use light energy to make their own food.

A body that slides down a smooth slope turns all of its potential energy mgh into translational kinetic energy and reaches the bottom with a speed equal to the square root of 2gh.