Tag: physics

Questions Related to physics

If for a given angle of projection, the horizontal range is doubled, the time of flight becomes

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. $4 times$

  2. $2 times$

  3. $\sqrt 2 \;times$

  4. $\frac{1}{{\sqrt 2 }}\;times$

Show answer
Correct Option: C
Explanation:
$r=\dfrac { { u }^{ 2 }\sin2\theta  }{ g } $
Hence $R=2r=\dfrac { { V }^{ 2 }2\sin2\theta  }{ g } $
${ u }^{ 2 }=\dfrac { { V }^{ 2 } }{ 2 } \Rightarrow V=\left[ { \left( 2 \right)  }^{ 1/2 } \right] 4$
$t=\dfrac { 2u\sin\theta  }{ g } $
$T=\dfrac { 2V\sin\theta  }{ g } $
    $=\dfrac { 2\times { 2 }^{ 1/2 }\times u\sin\theta  }{ g } $
    $=\left( { 2 }^{ 1/2 } \right) t$
    $={ \left( 2 \right)  }^{ 1/2 }$
    $=\sqrt { 2 } $ times

Two identical satellites are moving in the same circular orbit around the earth but in opposite senses of rotation, Assuming an inelastic collision to take place, so that the wreckage remains as one piece of tangled material  wreckage

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. will be moving in a circular orbit of half the radius

  2. will be moving in a circular orbit on one fourth the radius

  3. will spin with no translatory motion

  4. falls directly down

Show answer
Correct Option: C
Explanation:

The wreckage will spin with no translatory motion$.$

Hence,
option $(C)$ is correct answer.  

Which of the following is an Air-to-Air Missile?

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. Astra

  2. Aakash

  3. Prithvi

  4. None of these

Show answer
Correct Option: A
Explanation:

Astra is an all weather beyond-visual-range air-to-air missile developed by the DRDO, India.

What should be done to successfully convert the format of an image from BMP to JPEG ?

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. Compress the file

  2. Rename the image

  3. Use the save as command

  4. Change the image file extension

Show answer
Correct Option: D
Explanation:

Open paint and then open your BMP file, Next click on file and then save as. In newer version of paint that have the ribbon interface click on the title menu icon, in the Save As type dropdown choose the JPEG as the file format.

Geo stationary satelites revolves at:

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. Any height

  2. Fixed height

  3. Height above pole

  4. height which depends upon its mass

Show answer
Correct Option: B
Explanation:

Geo stationary satellite revolves at fixed height. A Geo stationary satellite is an earth orbiting satellite which is placed at an altitude of approximately 35,800 kms directly over the equator, that revolves in the same direction the earth rotates.

Validation of programs is used to check that data is

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. In right format

  2. Of right type

  3. Within possible value ranges

  4. All of above

Show answer
Correct Option: D
Explanation:

Data validation is a process of ensuring data have undergone data cleansing to ensure they have data quality i.e they are both correct and useful. Apart from data cleansing the data must be within possible value range that ensures smooth and effective functioning of the space satellite. Hence all the three option are correct.

Why would a switch be used in a network in preference to a HUB ?

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. To reduce the network traffic

  2. To prevent the spread of all viruses

  3. To connect a computer directly to the internet

  4. To manage password security at the work station

Show answer
Correct Option: A
Explanation:

A switch can be used in a network in preference to HUB because a switch helps far better than a HUB to reduce the network traffic.

Equipment and programs used to process raw data into information are called

physics universe and space science launching of an artificial satellites around the earth launching of satellite india’s space programmes

  1. Information

  2. Information technology

  3. Information processes

  4. Raw data

Show answer
Correct Option: B
Explanation:

Information technology is the study of the use of computers to store, retrieve, transmit and manipulate data(or information). It is considered to be a subset of Information and Communication Technology(ICT).

In Melde's experiment, eight loops are formed with a tension of $0.75\space N$. If the tension is increased to four times then the number of loops produces will be

physics free, damped and forced oscillations melde's experiment free, forced and damped oscillations sonometer and laws of transverse vibrations

  1. $2$

  2. $4$

  3. $8$

  4. $16$

Show answer
Correct Option: B
Explanation:

$Tp^2=constant$
$T _1P _1^2=T _2p _2^2$
$\dfrac{T _2}{T _1}=\dfrac{p _1^2}{p _2^2}$
$\Rightarrow \dfrac{p _1^2}{p _2^2}=4\Rightarrow p _2^2=\dfrac{p _1^2}{4}$
$\Rightarrow p _2^2=\dfrac{64}{4}=16$
$\Rightarrow p _2=4$

Periodic vibrations of decreasing amplitude are called

physics free, damped and forced oscillations melde's experiment free, forced and damped oscillations sonometer and laws of transverse vibrations

  1. Over Vibrations

  2. Critical Vibrations

  3. Damped Vibrations

  4. None of these

Show answer
Correct Option: C