During fusion of hydrogen into helium________________?

A. Energy is absorbed
B. Energy is released
C. Mass is increased due to energy absorption
D. Mass is reduced due to the energy released

One AMU is equal to__________________?

A. 1.66 x 10-27kg
B. 166 x 10-15ng
C. 166 x 10-20g
D. All of above

Which one is a unit vector ?

A. ??3 i^ + ??3 j^ + ??3 k^
B. 1/??3 i^ + 1/??3 j^ +1/ ??3 k^
C. ??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
D. Both b and c are correct

An angle between two vectors A and B can be determined by_____________?

A. Their dot product
B. Their cross product
C. Head to tail rule
D. Right-hand rule

The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?

A. 30°
B. 45°
C. 60°
D. 180°

The cross product of two vectors is a negative vector when______________?

A. They are parallel vectors
B. They are anti parallel vectors
C. They are a perpendicular vector
D. They are rotated through 270°

In which quadrant, the only value of tan will be positive ?

A. First
B. Second
C. Third
D. Both 1st and 3rd

The magnitude of i^. (j^ x k^) is________________?

A. 0
B. 1
C. -1
D. I^

If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________?

A. b = ax bx + ay by + az bz
B. A. b = ax by + ay bz + az by
C. A. b = ay bz + az by + az bx
D. A. b = ax bz + ay by + az bx

A central force is that which__________________?

A. Can produce torque
B. Cannot produce torque
C. Some time can produce torque some time cannot
D. Has no relation with torque