Subject: Science and Technology

Assertion (A): In our houses, the current in AC electricity line changes direction 60 times per second.
Reason (R): The frequency of alternating voltage supplied is 60 hertz.

Param Padma, which was in the news recently, is:

Where was the world’s largest-ever meet on HIV/AIDS held in July 2004?

Which one of the following diseases of milching animals are infectious? 1. Foot and Mouth disease; 2. Anthrax; 3. Black Quarter; 4. Cowpox. Select the correct answer using the codes given below.

Consider the following statements concerning Dengue:
1. Dengue is a protozoan disease transmitted by mosquitoes;
2. Retro-orbital pain is not a symptom of Dengue;
3. Skin rash and bleeding from nose and gums are some of the symptoms of Dengue.
Which of the statements given above is/are correct?

Consider the following statements concerning the Indian Railways: The Head Quarters of the North Western Railway are located at Jodhpur; ‘Indrail pass’ – a travel-as-you-please ticket has been created especially for freedom fighters and sportspersons who have represented India in any game/sport; Fairy Queen is a train using the world’s oldest working engine and the Indian Railways conduct a journey of wildlife and heritage sites on it. Which of the statements given above is/are correct?

Virtual water trade is being looked at by experts as a solution to the world’s water crisis. What does virtual water (VW) imply?

Assertion (A): A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at sea level.
Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

Four wires of the same material and of dimensions as under are stretched by a load of the same magnitude separately. Which one of them will be elongated maximum?

What is the average distance (approximate) between the Sun and the Earth?