Options:
- A. its K.E is doubled
- B. its acceleration is doubled
- C. its P.E is doubled
- D. its momentum is doubled
View Answer
D. its momentum is doubled
Physics
A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?
Options:
- A. 0.01J
- B. 0.02J
- C. 0.04J
- D. 1.0J
View Answer
A. 0.01J
Energy needed to magnetize and demagnetize is represented by _________________?
Options:
- A. Hysteresis curve
- B. Hysteresis loop area
- C. Hysteresis loop
- D. Straight line
View Answer
B. Hysteresis loop area
In a semiconductors the charge carriers are ___________________?
Options:
- A. Holes only
- B. Electrons only
- C. Electron and holes both
- D. All of the above
View Answer
C. Electron and holes both
Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
Options:
- A. BINA cosa
- B. BINA sina
- C. BINA tana
- D. BINA
View Answer
D. BINA
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
Options:
- A. a most sensitive galvanometer is used
- B. a steady voltage cell is used
- C. the balance point is close to the middle of the wire
- D. a high resistance box is used in one of its gap
View Answer
C. the balance point is close to the middle of the wire
Electromagnetic waves transport___________________?
Options:
- A. Energy
- B. Momentum
- C. Mass
- D. Heat
View Answer
A. Energy
A choke is used as a resistance in_________________?
Options:
- A. DC circuit
- B. AC circuits
- C. Both AC and DC circuit
- D. Full wave rectifier circuit
View Answer
B. AC circuits
Cos?i^ + Sin?j^ is a_________________?
Options:
- A. Vector
- B. Position Vector
- C. Vector in the direction at angle ? with an x-axis
- D. The unit vector in the direction at angle ? with an x-axis
View Answer
D. The unit vector in the direction at angle ? with an x-axis
Two vectors A and B are making angle ? with each other. The scalar projection of vector B on vector A is written as____________?
Options:
- A. A.B/A
- B. A.B/B
- C. A.cos?
- D. Both a and b are correct
View Answer
A. A.B/A