Tag: physics

Questions Related to physics

Fill in the blank.
Hubble transmits about _____ of raw science data every week.

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. 100 gigabits

  2. 140 gigabits

  3. 180 gigabits

  4. 200 gigabits

Show answer
Correct Option: B
Explanation:

Hubble data was initially stored on the spacecraft in reel-to-reel tape recorders but these were replaced by solid state data storage facilities during serving missions 2 and 3A. Hubble transmits about 140 gigabits of raw science data every week.

The Corrective Optics Space Telescope Axial Replacement (COSTAR) system was designed to correct the _______________________ for light focused at the FOC, FOS, and GHRS.

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. visual aberration

  2. spherical aberration

  3. diffraction

  4. none of the above

Show answer
Correct Option: B
Explanation:

The Corrective Optics Space Telescope Axial Replacement(COSTAR) system was designed to correct the spherical aberration for light focused at the FOC, FOS and GHRS. Spherical aberration is the condition when there is a loss in the definition of the image arising from the surface geometry of a spherical mirror or lens. Hence to solve this  condition COSTAR was designed.

Astronomical data taken with ________________ must undergo several calibration steps before they are suitable for astronomical analysis

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. HOST

  2. CCD

  3. CCR

  4. none of the above

Show answer
Correct Option: B
Explanation:

Astronomical data taken with CCD (charged couple devices) must undergo several calibration steps before they are suitable for astronomical analysis.

The unique window(s) on the Universe enabled by Hubble is/are :

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. Hubble Deep Field

  2. Hubble Ultra-Deep Field

  3. Hubble Extreme Deep Field

  4. All of the above

Show answer
Correct Option: D
Explanation:

The unique windows on the universe enabled by Hubble are Hubble deep field, Hubble Ultra-Deep Field and Extreme Deep Field.

All images from Hubble are ___________________,in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. advanced diffracted

  2. monochromatic grayscale

  3. Lucky Cam

  4. none of the above

Show answer
Correct Option: B
Explanation:

All images from Hubble are monochromatic gray scale, in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

The GHRS was a spectrograph designed to operate in the ___________.

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. infrared

  2. ultraviolet

  3. visible

  4. none of the above

Show answer
Correct Option: B
Explanation:

The GHRS was a spectrograph designed to operate in ultraviolet light. It was installed on the Hubble Space Telescope during its original constructing and it was launched into space as a part of the space telescope abroad the space shuttle on April 24,1990.

To fit the COSTAR system onto the telescope, one of the other instruments had to be removed, and astronomers selected the________________________to be sacrificed.

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. CCD

  2. HOST

  3. High Speed Photometer

  4. none of the above

Show answer
Correct Option: C
Explanation:

To fit the COSTAR system onto the telescope one of the other instruments had to be removed, and astronomer selected the High Speed Photometer (HSP) to be sacrificed.

Hubble's four main instruments observe in the near

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. ultraviolet range

  2. infrared range.

  3. red wavelength range

  4. yellow wavelength range

Show answer
Correct Option: A,B
Explanation:

The instruments of hubble that analyses light from the universe such as cameras, spectrographs and inter ferometers helps in observing the near UV (ultraviolet range) to IR (infrared range).

Which of the following instruments is used for seeing details of celestial bodies?

physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

  1. Spectroscope

  2. Periscope

  3. Microscope

  4. Telescope

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Correct Option: D
Explanation:

Clearly Telescope instrument used for seeing details of celestial bodies.

For an LCR circuit, the power transferred from the driving source to the driven oscillator is $P = I^2Z cos\phi$ Then

physics alternating current power in ac circuits average power in ac circuit and power factor power in ac circuit

  1. the power factor $cos \phi > 0, P > 0$.

  2. the driving force can give no energy to the oscillator (P = 0) in some cases.

  3. the driving force cannot syphon Out (P < 0) the energy out of oscillator.

  4. all of these.

Show answer
Correct Option: D
Explanation:

Power Factor:

(1) It may be defined as cosine of the angle of lag or lead $(i.e, \cos \phi)$
(2) It is also defined as the ratio of resistance and impedance $\left(i.e, \dfrac{R}{Z}\right)$

(3) The ratio $= \dfrac{\text{True power}}{\text{Apparnet power}} = \dfrac{W}{VA} = \dfrac{kW}{kVA} = \cos \phi$

In the given problem power transferred,
$P = I^2Z \cos \phi$
where $I$ is the current, $Z=$ Impedance and $\cos \phi$ is power factor

(a) As power factor, $\cos \phi = \dfrac{R}{Z}$
where $R > 0$ and $Z > 0$
$\Rightarrow \cos \phi > 0 \Rightarrow P > 0$

(b) When $\phi = \dfrac{\pi}{2}$  (in case of $L$ of $C$), $P = 0$.

(c) From (a), it is clear that $P < 0$ is not possible