Class XI

. Radish is a
  1. bulb
  2. conn
  3. modified root
  4. tuber
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
  1. moves in opposite direction in which the air is blown
  2. . does not move
  3. . moves in the same direction in which air blows
  4. spins around
Of the following properties of a wave, the one that is independent of the other is its
  1. amplitude
  2. . velocity
  3. wavelength
  4. frequency
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
  1. 0.14 m/s
  2. . 140 m/s
  3. 1.4 km/s
  4. 14 m/s
Plants absorb dissolved nitrates from soil and convert them into
  1. free nitrogen
  2. urea
  3. ammonia
  4. proteins
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