Question
What is Global Positioning System? Explain its working principle in brief.
✓
Answer
Global Positioning System is method of identifying location or position of any point or a person on earth using a system of 24 satellites, which are continuously orbiting, observing, monitoring and mapping the earth.
Working Principle:
Working Principle:
- The unique location of GPS user is determined by measuring its distance from at least three GPS satellites.
- Using these values of distances, obtained from three satellites, a microprocessor, fitted in GPS device, determines the exact location.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of 30 turns and radius 12 cm. The coil is in a vertical plane making an angle of 45° with the magnetic meridian. When the current in the coil is 0.35 A, the needle points west to east.
- Determine the horizontal component of the earth’s magnetic field at the location.
- The current in the coil is reversed, and the coil is rotated about its vertical axis by an angle of 90° in the anticlockwise sense looking from above. Predict the direction of the needle. Take the magnetic declination at the places to be zero.
(a) Which of the following can be a source for origin of electromagnetic waves? Give reason.
(i) A charge moving with constant speed
(ii) Charge undergoing circular motion
(iii) Fixed charge.
(b) Name that part of electromagnetic spectrum with which waves of frequency
(i) $10^{20} Hz$,
(ii) $10^9 Hz$ associated.
→(i) A charge moving with constant speed
(ii) Charge undergoing circular motion
(iii) Fixed charge.
(b) Name that part of electromagnetic spectrum with which waves of frequency
(i) $10^{20} Hz$,
(ii) $10^9 Hz$ associated.
A spherical shell made of plastic, contains a charge Q distributed uniformly over its surface. What is the electric field inside the shell? If the shell is hammered to deshape it without altering the charge, will the field inside be changed? What happens if the shell is made of a metal?
A proton and an $\alpha$ particle move perpendicular to a magnetic field. Find the ratio of radii of circular paths described by them when both have (i) equal velocities, and (ii) equal kinetic energy.
→The near point and the far point of a child are at 10cm and 100cm. If the retina is 2.0cm behind the eye-lens, what is the range of the power of the eye-lens?
A pole of length 1.00m stands half dipped in a swimming pool with water level 50.0 cm higher than the bed. The refractive index of water is 1.33 and sunlight is coming at an angle of 45° with the vertical. Find the length of the shadow of the pole on the bed.
The earth’s surface has a negative surface charge density of 10-9 Cm-2. The potential difference of 400 kV between the top of the atmosphere and the surface results (due to the low conductivity of the lower atmosphere) in a current of only 1800 A over the entire globe. If there were no mechanism of sustaining atmospheric electric field, how much time (roughly) would be required to neutralise the earth’s surface? (This never happens in practice because there is a mechanism to replenish electric charges, namely the continual thunderstorms and lightning in different parts of the globe). (Radius of earth = 6.37 × 106 m.)
A block is kept on the floor of an elevator at rest. The elevator starts descending with an acceleration of 12m/s2. Find the displacement of the block during the first 0.2s after the start. Take g = 10m/s2.
A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?