UPSC Prelims Full Length Test - 23

Which among the following is / are correct statements?

1. The images produced by Concave Mirrors are always real images
2. The images produced by Flat Mirrors are always virtual images
3. Converging Lens can produce virtual as well as real images

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The FM transmission of music is of very good quality in comparison to AM transmission. Consider the following statements with this reference:

1. The AM signals are more susceptible to noise
2. The FM receiver locks itself to catch stronger signal only
3. The wavelength of AM waves is much higher in comparison to the FM waves

Which among the above is / are correct statements?

With respect to the measurements of the acceleration g due to the gravity of the Earth, different values of g are found at different?

1. Depths
2. Altitudes
3. Longitudes
4. Latitudes

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What is / are the objectives of using tubeless tyres in the aircrafts?

1. To reduce chances of detaching the tyre from the rim
2. To make them withstand shocks better
3. To allow them withstand heat

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In recent times, the Digital Signatures have become of immense value in internet related communications. What is / are uses of the Digital signature?

1. By using digital signature, a sender cannot deny a message which he / she has sent to a receiver
2. Digital signature can be used a legal proof to ensure that the message was sent by certain sender
3. Digital signature is used for safe communication between two computers of a closed network
4. Digital signatures are required to send all email messages

Select the correct option from the codes given below: