M5-OQ1  An imaginary line lying on the ground surface but having constant inclination to the horizontal is known as

1. contour line
2. contour gradient
3. ridge line
4. valley line

M5-OQ2 The uniform vertical distance between successive contour is known as

1. horizontal equivalent
2. contour gradient
3. contour interval
4. slope

M5-OQ3 The angle of intersection between a ridge line and a contour is

1. 0^o
2. 30^o
3. 45^o
4. 90^o

M5-OQ4 The direction of  steepest slope on a contour is

1. at right angle to contour
2. along the contour
3. at 45^o to the contour
4. varies from contour to contour

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