If an object undergoes a uniform circular motion, then its -
(a) acceleration remains uniform
(b) velocity changes
(c) speed changes
(d) velocity remains uniform
A current-carrying wire is known to produce magnetic lines of force around the conducting straight around
wire. The direction of the lines of force may be described by -
(a) left-had thumb rule for up-current and right-hand thumb rule for down-current
(b) right-hand thumb rule for up-current and left-hand thumb rule for down-current
(c) right-hand thumb rule for both up and down currents
(d) left-hand thumb rule for both up and down currents
If d denotes the distance covered by a car in time t and
→S
denotes the displacement by the car during the
same time, then -
(a) d ≤ |
→
S |
(b) d = |
→S
| only
(c) d ≥ |
→S
|
(d) d < |
→
S |
An ant is moving on thin (negligible thickness) circular wire. How many coordinates do you require to
completely describe the motion of the ant ?
(a) One (b) Two (c) Three (d) Zero
Which of the following statements regarding the property of hard water is/are correct ?
1. Temporary hardness of water is due to the presence of soluble magnesium and calcium hydrogen carbonate
2. Temporary harndness of water can be removed by boiling
3. Calgon's method is applied to remove temporary hardness of water
4. Permanent hardnes of water is removed by Clark's method
Select the correct answer using the code given below :
(a) 1 and 2 only
(b) 1, 2 and 3
(c) 3 and 4
(d) 2 only
Water is a good solvent. This is due to high -
(a) dielectric constant of water
(b) surface tension of water
(c) specific heat of water
(d) heat of fusion of water