A pilot flies a small plane in a vertical loop of radius r. At the top of its tr

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Question
A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be
Options
A. zero
B. infinite
C. gr
D. 2gr.

Correct Answer

2. Which one of the following statements is true for Mohr-Coulomb envelope?
Options
A. Coulomb suggests that the relationship between shear strength and normal stress, is adequately represented by the straight line
B. The generalised Mohr theory suggests that, though the shear stress depends on the normal stress, the relation is not linear
C. Coulomb and Mohr suggest that a definite relationship exists among the principal stress and the angle of internal friction
D. For an ideal pure friction material, the straight line passes through the origin.
E. All the above.

3. Which one of the following laws is not applicable to a simple pendulum?.
Options
A. The time period does not depend on its magnitude
B. The time period is proportional to its length l
C. The time period is proportional to l where l is length
D. The time period is inversely proportional to g where g is the acceleration due to gravity.

4. Which one of the following statement is correct?
Options
A. Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
B. The rate of transfer of radiant energy is called flux and is expressed in watts.
C. The radiant energy which falls upon a surface, is termed as irradiance.
D. The radiant energy which falls away from the surface is termed as radient exitance and is measured in Wm^-2
E. All of these

6. Consider the following statements regarding the satellite imaging :
1. The satellite orbit is fixed in the inertial space
2. During successive across-track imaging, the earth rotates beneath the sensor
3. The satellite images a skewed area
Which one of the following statements is/are correct?
Options
A. 1, 2, 3
B. 1, 3
C. 2, 3
D. 1, 2

7. Which one of the following statements is correct?
Options
A. Each satellite of the GPS system transmits two L band signals.
B. The two L band signals are modulated by the Pseudorandom binary codes (PN).
C. The GPS receiver reads the specific code of the satellite.
D. The PN code determines the time taken by the receiver to reach the receiver which is converted into distance
E. All of these

8. Which one of the following statements is correct?
Options
A. The ratio of the permitivity of a medium and the free space, is called relative permitivity.
B. Dielectric constant is a pure number and has no dimensions.
C. The dielectric constant of pure water is 80.
D. Higher the dielectric constant of a medium, the poorer is its electric conductivity.
E. All of these

9. In which part of the reflective optical infrared region, the effect of multiple leaves in vegetation canopy is maximum?
Options
A. The near-IR (0.7 - 1.3 ?m) region
B. The visible (0.4 - 0.7 ?m) region
C. The short wave IR (1.3 - 2.7 ?m) region
D. In all the above region

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