Question Discussion & Solution

The correct answer is ​Red and yellow soil.

Key Points

• Red and Yellow Soil:
  • Red soil develops on crystalline igneous rocks in areas of low rainfall in the eastern and southern part of the Deccan Plateau. Hence option 1 is correct.
  • Along the piedmont zone of the Western Ghat, a long stretch of area is occupied by red loamy soil.
  • Yellow and red soils are also found in parts of Odisha and Chhattisgarh and in the southern parts of the middle Ganga plain.
  • The soil develops a reddish colour due to a wide diffusion of iron in crystalline and metamorphic rocks.
  • It looks yellow when it occurs in a hydrated form.
  • The fine-grained red and yellow soils are normally fertile, whereas coarse-grained soils found in dry upland areas are of poor infertility.
  • They are generally poor in nitrogen, phosphorous and humus.

The correct answer is Three.

According to the Dowry Prohibition Act, 1961, 3 conditions related to dowry have been stated.

Key Points

Dowry Prohibition Act, 1961

• Dowry Prohibition Act, Indian law, enacted on May 1, 1961, intended to prevent the giving or receiving of a dowry.
• Under the Dowry Prohibition Act, dowry includes property, goods, or money given by either party to the marriage, by the parents of either party or by anyone else in connection with the marriage.
• There are three occasions related to dowry.
  • One is before the marriage,
  • The second is at the time of marriage 
  • The third is at any time after the marriage. The third occasion may appear to be an unending period. But the crucial words are in connection with the marriage of the said parties.

The correct answer is Scanner.

Key Points

• Scanner:
  • Scanner is an input device and can be used to scan images as well as text documents.
  • Scanner is not a pointing input device.
• ​Pointing device
  • A pointing device is an input interface that allows a user to input spatial data to a computer. 
  • Common pointing devices
    • Mouse
    • Trackball
    • Joystick
    • Pointing stick
    • Wii Remote
    • Finger tracking
    • Graphics tablet
    • Stylus
    • Finger tracking

Additional Information

• Track Ball:
  • The trackball is a pointing device consisting of a ball housed in a socket containing sensors to detect rotation of the ball about two axes, similar to an upside-down mouse..
  • Tracker balls are commonly used on CAD workstations​
• Digitizing Tablet:
  • A digitizer tablet is a peripheral device that allows users to draw on a computer screen.
• Joystick:
  • A joystick is a lever-type device that can be moved in several directions.
  • Used to control the movement of an image on a computer or similar display screen.

Ammeter is an instrument used to measure Current.

Similarly, Hygrometer is an instrument used to measure Humidity

The correct answer is Curvature of the lens.

Important Points

• Focal length of a lens depends on its curvature and the medium outside the lens.

Additional Information

• The ability of a lens to converge or diverge light rays depends on its focal length.
  • For example, a convex lens of short focal length bends the light rays through large angles, by focussing them closer to the optical centre.
  • Similarly, the concave lens of a very short focal length causes a higher divergence than the one with a longer focal length.
• The degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its power.
  • The power of a lens is defined as the reciprocal of its focal length.