Let $\theta$ be the angle between vectors $\overrightarrow A$ and $\overrightarrow {B}$. Which of the following figures correctly represents the angle $\theta$?

1.		2.
3.		4.

If the angle between the two forces increases, the magnitude of their resultant:

1. Decreases

2. Increases

3. Remains unchanged

4. First decreases, then increases

The vector sum of two forces is perpendicular to their vector difference. In that case, the forces:

Current in a circuit is given by $i =3t^2+2t$. Find charge that crosses a cross-section from time t=0 to t=2 sec.

1. 12 C

2. 10 C

3. 8 C

4. 2 C

The dot product of two mutual perpendicular vector is:

1. $0$

2. $1$

3. $\infty$

4. None of the above

When $\overrightarrow{\mathrm{A}}.\overrightarrow{\mathrm{B}}=-\left|\mathrm{A}\right|\left|\mathrm{B}\right|$, then

1. $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ are perpendicular to each other

2. $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ act in the same direction

3. $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ act in the opposite direction

4. $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ can act in any direction

If for two vectors $\overrightarrow{A}$ and $\overrightarrow {B}$, $\overrightarrow {A}\times \overrightarrow {B}=0$, then the vectors:

A particle moves from position null to $\left(11\hat i + 11\hat j + 15\hat k \right)$ due to a uniform force of $\left(4\hat i + \hat j + 3\hat k\right)$N. If the displacement is in m, then the work done will be: (Given: $W=\overrightarrow {F}.\overrightarrow {S}$)
1. $100~\text{J}$
2. $200~\text{J}$
3. $300~\text{J}$
4. $250~\text{J}$

A plane is revolving around the earth with a speed of 100 km/hr at a constant height from the surface of the earth. The change in the velocity as it travels half-circle is:

1. 200 km/hr

2. 150 km/hr

3. $100\sqrt{2}$ km/hr

4. 0

If vectors $\hat{\mathrm{i}}-3\hat{\mathrm{j}}+5\hat{\mathrm{k}}$ and $\hat{\mathrm{i}}-3\hat{\mathrm{j}}-\mathrm{\alpha }\hat{\mathrm{k}}$ are equal vectors, then the value of $\mathrm{\alpha }$ is:

1. -5

2. 2

3. -3

4. 4