RRB NTPC GK Questions 2026

Churchill, by then out of office, spoke at Westminster College in Fulton on 5 March 1946 and said that an iron curtain had descended across the continent from Stettin in the Baltic to Trieste in the Adriatic.

Bolivia, fighting alongside Peru, was defeated by Chile and lost the nitrate-rich Atacama coast, so that it has had no access to the Pacific since; the dispute still colours relations between the two countries, and Bolivia observes a Day of the Sea every year and keeps a naval force on…

The Vatican, about 0.44 square kilometres inside Rome, is both the smallest country in the world and the smallest landlocked country; it is the seat of the Pope and the smallest member of the family of sovereign states.

Lesotho lies wholly within South Africa and is one of only three countries in the world surrounded by a single neighbour, the other two being San Marino and Vatican City, both inside Italy.

Laos, officially the Lao People's Democratic Republic, is the only state in South East Asia without a sea coast; it is bordered by China, Vietnam, Cambodia, Thailand and Myanmar, and the Mekong, which forms much of its western boundary, is its chief waterway and source of hydroelectric power.

Eritrea became independent of Ethiopia in 1993 after a long war and took with it the entire Red Sea coast, including the ports of Massawa and Assab, leaving Ethiopia landlocked; Ethiopia is today the most populous landlocked country in the world and routes most of its trade through Djibouti.

Bolivia and Paraguay are the only two landlocked states in South America. Paraguay has no coast but reaches the Atlantic along the Paraguay and Parana rivers, which carry most of its trade; Bolivia lost its Pacific coast to Chile in the War of the Pacific of 1879 to 1883.

Of the forty-four landlocked countries in the world, sixteen are in Africa, among them Chad, Niger, Mali, Burkina Faso, Ethiopia, Uganda, Rwanda, Burundi, Zambia, Zimbabwe, Botswana, Malawi and Lesotho; the colonial boundaries drawn in the nineteenth century are the reason so many African states were left without a coast.

Kazakhstan is the ninth largest country in the world and by far the largest with no sea coast. Its shore on the Caspian does not change this, because the Caspian is the world's largest lake and has no natural connection with the ocean, so Kazakhstan is counted as landlocked.

A doubly landlocked country is one that is surrounded only by landlocked countries, so at least two international borders must be crossed to reach the sea.

The coastal states of India, counted from the west coast round to the east, are Gujarat, Maharashtra, Goa, Karnataka, Kerala, Tamil Nadu, Andhra Pradesh, Odisha and West Bengal; Gujarat has the longest coastline among them.

If the frequency of the soldiers' rhythmic steps happens to match the natural frequency of the bridge, the bridge is driven at its own frequency and its amplitude of vibration can build up to a dangerous level; breaking step destroys the rhythm and avoids the risk.

The Dutch scientist Huygens designed the first working pendulum clock in 1656, after Galileo had noticed that a swinging lamp took the same time for each swing whether it swung far or little, the property called isochronism.

In simple harmonic motion the acceleration equals minus omega squared times the displacement, so it grows with displacement and is greatest at the ends of the path, where its value is A omega squared and it points back towards the centre.

Potential energy is proportional to the square of the displacement, so it is greatest where the displacement is greatest, that is at the two ends of the path, where the body is momentarily at rest and its kinetic energy is zero.

The time period varies inversely as the square root of g, so if g falls to one sixth, the period is multiplied by the square root of six, about 2.45 times; the pendulum swings more slowly and a pendulum clock taken to the moon would lose time badly.

The time period varies as the square root of the length, so multiplying the length by four multiplies the period by the square root of four, that is by two; to double the period of a pendulum its length must be made four times.

A second's pendulum is one whose time period is exactly two seconds, so that each swing from one side to the other takes one second.

The time period of a simple pendulum is two pi times the square root of the length divided by g, in which the mass of the bob does not appear at all; a heavy bob and a light bob of the same length keep the same time, which is the…

A swing is a pendulum, and its speed is greatest at the lowest point, where all the potential energy gained at the top has turned into kinetic energy.