Physics

Which of the following statements with regard to Black Boxes used in modern aircrafts is/are correct ? 1. They carry a beacon emitting red light pulses to facilitate underwater detection. & They record both the cockpit voice and flight data. 3. Their memory units are made using either stainless steel or titanium. Select the answer using the code given below :

1. ‘X’, born in the UK, was conferred the Nobel Prize in 2025. He was a professor in an American bniversity when this prize was announced. Identify X -

With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Select the correct answer using the code given below.

Which one of the following is a reason why astronomical distances are measured in light-years?

In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following? 1. Area of the hole in the lid 2. Temperature of the flame 3. Weight of the lid. Select the correct answer using the code given below.

Recently, scientists observed the merger of giants ‘blackholes’ billions of lightyear away from the Earth. What is the significance of this observation?

Consider the following statements: 1. The Earth’s magnetic field has reversed every few hundred thousand years. 2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide. 3. When living organisms originated, they modified the early atmosphere of the Earth. Which of the statements given above is/are correct?

Consider the following phenomena : 1. Light is affected by gravity. 2. The Universe is constantly expanding. 3. Matter warps its surrounding space-time. Which of the above is/are the prediction/predictions of Albert Einstein’s General Theory of Relativity, often discussed in media ?

The terms ‘Event Horizon’, ‘Singularity’ ‘String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of

In the context of modem scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news:

During a thunderstorm, the thunder in the skies is produced by the 1\. meeting of cumulonimbus clouds in the sky 2\. lightning that separates the nimbus clouds 3\. violent upward movement of air and water particles Select the correct answer using the codes given below.

Ball bearings are used in bicycles, cars, etc., because

Consider the following phenomena: 1\. Size of the sun at dusk 2\. Colour of the sun at dawn 3\. Moon being visible at dawn 4\. Twinkle of stars in the sky 5\. Polestar beingvisible in the sky Which of the above are optical illusions?

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 1\. Dispersion 2\. Refraction 3\. Internal reflection Select the correct answer using the codes given below.

The known forces of nature can be divided into four classes, viz, gravity electromagnetism, weak nuclear force and strong nuclear force. with reference to them, which one of the following statements is not correct?

Consider the following statements: If there were no phenomenon of capillarity 1 it would be difficult to use a kerosene lamp 2 one would not be able to use a straw to consume a soft drink 3 the blotting paper would paper would fail to function 4 the big trees that we see around would not have grown on the earth **Which of the following statements given above are correct?**

team of scientists at Brookhaven National Laboratory including from India created the heaviest anti-matter (anti-helium nucleus). What is/are the implications of the creation of anti-matter? 1\. It will make mineral prospecting and oil exploration easier and cheaper. 2\. It will help probe the possibility of the existence of stars and galaxies made of anti matter. 3\. It will help understand the evolution of the universe. **Select the correct answer using the codes given below:**

An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth.

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?

A layer in the Earth’s atmosphere called Ionosphere facilitates radio communication. Why? 1. The presence of ozone causes the reflection of radio waves to Earth. 2. Radio waves have a very long wavelength. Which of the statements given above is/are correct?