List of top Physics Questions asked in GATE GE

Global Navigation Satellite System can be used for positioning and timing. The average geometric dilution of precision (GDOP) at a location is 1.0 and positional dilution of precision (PDOP) is 0.8. With the precision of the measurements being 300 m, the achieved precision of timing is __________ ns (Answer in integer).

Consider the speed of light is $ 3 \times 10^8 \, \text{m/s} $

The velocity ($V_s$) of a satellite moving in a circular orbit at a height of 1000 km above earth surface is ___________ km s$^{-1}$ (rounded off to 2 decimal places).
{($G = 6.67 \times 10^{-11}$ m$^3$ kg$^{-1}$ s$^{-2}$, $M_e = 5.972 \times 10^{24}$ kg and $r_e = 6378$ km)}

Which of the following statements is/are correct regarding across-track scanning sensor of an airborne optical imaging system?

Global Navigation Satellite System can be used for positioning and timing. The average geometric dilution of precision (GDOP) at a location is 1.0 and positional dilution of precision (PDOP) is 0.8. With the precision of the measurements being 300 m, the achieved precision of timing is __________ ns (Answer in integer). Consider the speed of light is $ 3 \times 10^8 \, {m/s} $

The relativistic effect in Global Navigation Satellite System satellites has two parts, of which the first part is the time dilation due to the shift in the fundamental frequency of the satellite clock. The second part is due to the satellite’s semi-major axis and __________

Match the following SAR sensors to their frequency bands:

\[ \begin{array}{|c|l|c|l|} \hline \textbf{Column I} & \textbf{SAR Sensor} & \textbf{Column II} & \textbf{Frequency Band} \\ \hline P & \text{NOVASAR} & 1 & \text{X-BAND} \\ Q & \text{RISAT-1} & 2 & \text{C-BAND} \\ R & \text{TERRASAR} & 3 & \text{L-BAND} \\ S & \text{ALOS PALSAR} & 4 & \text{S-BAND} \\ \hline \end{array} \]

The reflectance geometry of white-sky albedo can be represented as __________