# The conjugate of cos θ- I sin θ is

1.  cot θ + I sin θ

2.  cos θ + I tan θ

3.  tan θ + I sin θ

4.  cos θ + I sin θ

4

cos θ + I sin θ

Explanation :
No Explanation available for this question

# The least positive integral value of n for whichis

1.  2

2.  3

3.  4

4.  5

4

4

Explanation :
No Explanation available for this question

# If is a real number,then

1.  n=1

2.  n=2

3.  no n exists

4.  none

4

no n exists

Explanation :
No Explanation available for this question

# If,then x+y=

1.  -2/5

2.  6/5

3.  2/5

4.  None

4

2/5

Explanation :
No Explanation available for this question

# If ,then 4x2=

1.  0

2.  1

3.  2

4.  3

4

1

Explanation :
No Explanation available for this question

# If forces of magnitudes 6 and 7 units acting in the directions i-2j+2k and 2i-3j-6k respectively act on a particle which is displaced from P(2, -1, -3) to Q(5, -1, 1) then the work done by the forces is

1.  4

2.  -4

3.  7

4.  -7

4

4

Explanation :
No Explanation available for this question

# Three forces having magnitude 5, 4 and 3 act on a particle in the direction 2i-2j-k, i+2j+2k and -2i+2k respectively and the particle gets displacement rom the point A whose position vector is 6i-2j+3k to the point whose position

1.  -9 unit

2.  43 unit

3.  38 unit

4.  38/3 unit

4

-9 unit

Explanation :
No Explanation available for this question

# The work done by force F=ai+j+k in moving a particle from (1, 1, 1) to (2, 2, 2) along a straight line is 5 unit. Then a=

1.  1

2.  2

3.  3

4.  4

4

3

Explanation :
No Explanation available for this question

# If a=i+j+k, b=2i-3j+k then axb is

1.  4i+j-5k

2.  4i-j+5k

3.  4i+j+5k

4.  4i-j-5k

4

4i+j-5k

Explanation :
No Explanation available for this question

1.  9

2.  3√10

3.  √155

4.  5√5

4