Tag: physics

Questions Related to physics

The binary number of decimal number $(9.25)$$ _{10}$ is

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $1101.01$

  2. $1001.01$

  3. $1001.10$

  4. $1110.010$

Show answer
Correct Option: B
Explanation:

$(9.25) _{10} = (9) _{10} + (0.25) _{10} = (1001) _2 + (0.01) _2 = (1001.01) _2$

Sum of the two binary number $(100010) _2$ and $(11011) _2$ is

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $(111101) _2$

  2. $(111111) _2$

  3. $(101111) _2$

  4. $(111001) _2$

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Correct Option: A
Explanation:

$100010 + 11011 = (111101) _2$

Which one of the following gives the $2's$ complement of decimal number $13$?

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $0010$

  2. $0011$

  3. $1100$

  4. $1101$

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Correct Option: B
Explanation:

The binary representation of $13$ is $1101$. The $1's$ complement of $13$ is $0010$. The $2's$ complement of $13$ is $0010 + 1 = 0011$.

The BCD code for the character A is

physics electronic devices boolean algebra digital electronics and logic gates logic gates

  1. $1000$

  2. $1010$

  3. $1011$

  4. $1100$

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Correct Option: B

Mark the correct application of ultrasound:

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. Used in electrocardiography

  2. For monitoring a nuclear reaction

  3. For determining the depth of sea

  4. All

Show answer
Correct Option: D
Explanation:

Electrocardiography is a medical diagnostic

techniques, ultrasonic waves are used to construct the image of the heart, for

monitoring a nuclear reactor.

Range of frequency of ultrasound

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. 2kHz-106Hz

  2. 25kHz-1015Hz

  3. 2kHz-1010Hz

  4. 20kHz --107 Hz

Show answer
Correct Option: D
Explanation:

The frequency of an ultrasonic wave is greater than 20,000Hz and equal to 107Hz. These waves are not audible to a human ear but they can be heard by animals and birds.

The technique used by bats to find their way or to locate food is ______.

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. SONAR

  2. RADAR

  3. Echolocation

  4. Flapping

Show answer
Correct Option: C
Explanation:

Bats can produce ultrasonic waves by flapping their wings.
They can also detect these waves.these waves produced by the bats after reflection from the obstacles like building guide them to  remain away from the obstacles during night with the help of ultrasonic waves.

By what bats understands position and type of prey of any obstacle in way?

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. By detecting reflection of ultrasonic sound

  2. By detecting refraction of ultrasonic sound

  3. By detecting reflection of infrasonic sound

  4. By detecting deflection of infrasonic sound

Show answer
Correct Option: A
Explanation:

By detecting reflection of ultrasonic sound bats understands position and type of prey of any obstacle in way

What is ultrasound or ultrasonic sound?

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. Sound above frequency of 20000Hz

  2. Sound below frequency of 20000Hz

  3. Sound frequency of 20000Hz

  4. Sound above frequency of 20Hz

Show answer
Correct Option: A
Explanation:

Sound above frequency of 20000Hz is ultrasound or ultrasonic sound

How does bats catch their prey?

physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications

  1. By producing ultrasonic sound

  2. By producing infrasonic sound

  3. By producing sound

  4. None

Show answer
Correct Option: A
Explanation:

By producing ultrasonic sound which are sent to the prey and reflected back, to find the exact location of the prey and catch them.