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Let the slant height of the cone be ‘l’ cm. Curved surface area of the cone = π × r × l = 180 3 × 6 × I = 180 I = 10 cm Let height of the cone be ‘h’ cm. According to Pythagoras theorem: r2 + h2 = l2 62 + h2 = 102 h2 = 100 – 36 h = √64 = 8 So the volume of the cone = 1/3 × π × r2 × h = 1/3 × 3 × 36 × 8 = 288 cm2
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?
The distance- time graph for a body moving at uniform speed is?
In a concave mirror which of the following pair of position of object – size of the image is correct?
I. At infinity – point sized
Which of the following gas is used in the manufacture of Vanaspati Ghee?
A fluid flows through a horizontal pipe. The pressure drops by 2000 Pa and speed increases from 2 m/s to 4 m/s. Find density.
‘Lubb-dupp’ sound is produced due to the action of
Which of the following is a characteristic of a conductor?
A toroid has a core (non-ferromagnetic) of inner radius 23 cm and outer radius 28 cm, around which 4000 turns of a wire are wound. If the current in th...
Stereo was invented by .
Which of the following is not a nuclear reaction?