RRB Group D GK Questions 2026

The correct answer is C, the Ganga, Bhagirathi and Hooghly, from Haldia in West Bengal to Prayagraj in Uttar Pradesh, about 1,620 kilometres, declared the first national waterway in 1986 and being deepened under the Jal Marg Vikas Project with terminals at Varanasi, Sahibganj and Haldia.

The correct answer is B, Gorakhpur, in eastern Uttar Pradesh, which is the headquarters of the North Eastern Railway and has one of the longest railway platforms in the country.

Because the river silts up, the port needs continuous dredging and large ships are handled at the Haldia dock complex downstream.

The correct answer is C, NH-44, which runs from Srinagar to Kanyakumari over about 3,745 kilometres through Jammu, Delhi, Agra, Gwalior, Nagpur, Hyderabad, Bengaluru and Madurai, and was formed by merging several older highways at the time of renumbering.

The train ran on 16 April 1853 over about 34 kilometres, pulled by three locomotives named Sahib, Sindh and Sultan, and the day is counted as the birth of the Indian Railways.

It is formed from the roots of the lower spine, passes through the buttock and runs down the back of the thigh to the leg and foot, and its compression by a slipped disc causes the pain called sciatica.

An injury here is fatal because these actions cannot be done at will.

It quickens the heartbeat, raises the blood pressure, widens the air passages, sends more blood to the muscles and releases glucose from the liver, so that the body is ready to fight or to run.

The cranial nerves arise from the brain and serve the head and neck, among them the optic nerve of sight, the auditory nerve of hearing, the olfactory nerve of smell and the vagus, which is the longest cranial nerve and reaches down to the heart, lungs and stomach.

Iodine is needed to make thyroxine, so when the diet is short of it the thyroid gland works harder and enlarges into a visible swelling of the neck called goitre; a severe shortage in a growing child causes cretinism and in an adult myxoedema, and iodised salt is the standard…

Insulin lowers the level of glucose in the blood by helping the cells take it in and by having the liver store it as glycogen, and a want of insulin or a failure of the body to respond to it causes diabetes mellitus.

It is called the master gland because its secretions control other glands: thyroid stimulating hormone drives the thyroid, adrenocorticotropic hormone the adrenal cortex, and the gonadotropins the testes and ovaries, besides its own growth hormone.

The correct answer is B, the cerebellum, which lies below and behind the cerebrum and coordinates the work of the muscles so that movement is smooth and the body stays balanced; this is why a person whose cerebellum is affected by alcohol staggers.

The correct answer is B, the thyroid gland, a butterfly-shaped gland in front of the windpipe in the neck, which is the largest purely endocrine gland in the body and secretes thyroxine, triiodothyronine and calcitonin.

The brain is the organ that interprets pain, but its own tissue has no pain receptors, so cutting or pricking it causes no sensation; the covering membranes, the blood vessels and the scalp do have receptors, which is why a headache hurts.

Photosynthesis makes carbohydrate and gives out oxygen, and of the four choices here only oxygen is something the plant produces.

The number of moles is the given mass divided by the molar mass, so 60 grams of helium divided by 4 grams per mole gives 15 moles.

A mole is a count, not a weight: one mole of any element holds 6.022 into 10 to the power 23 atoms, the Avogadro number, whatever the element is.

Oil does not dissolve in water; it stays as a separate layer or as floating droplets, so the mixture is heterogeneous and the boundary between the two liquids can be seen.

Reduce the parallel pair first: 20 into 30 divided by 50 gives 12 ohms. Adding the 8 ohm resistor in series makes the circuit resistance 20 ohms, so the battery drives 12 volts divided by 20 ohms, that is 0.6 ampere, through the whole circuit.