Download App

STD 11 - 3.1 , vectors — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 3.1 , vectors4 Marks
MCQ
Two vectors $\overrightarrow A $ and $\overrightarrow B $ are at right angles to each other, when
  • A
    $\overrightarrow A + \overrightarrow B = 0$
  • B
    $\overrightarrow A - \overrightarrow B = 0$
  • C
    $\overrightarrow A \times \overrightarrow B = 0$
  • ✓
    $\overrightarrow A \,.\,\overrightarrow B = 0$
✓

Answer

Correct option: D.
$\overrightarrow A \,.\,\overrightarrow B = 0$
d
(d) $\vec A.\vec B = \,|\vec A|.|\vec B|.\cos \theta = \vec A.\vec B.\cos 90^\circ = 0$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

In a plane electromagnetic wave, which of the following has/ have zero average/value in one complete cycle?

$(a)$ Magnetic field

$(b)$ Magnetic energy

$(c)$ Electric field

$(d)$ Electric energy

→
A stone of mass $150\ g$ moves in a vertical circle on the end of a length of string. The radius of the cirlce is $70\ cm$ and the speed of the stone at the topmost point $P$ is $3.5\ m/s$ . For the instant at which the stone passes through the highest point $P$ , the centripetal force is nearly    ......... $N$ (take $g = 10\ m/s^2$ )
→
For a thermodynamic process $\delta Q = -50$ $calorie$ and $W = -20$ $calorie$ . If the initial internal energy is $-30$ $calorie$ then final internal energy will be ....... $calorie$
→
When a light source of power $P$ emitting monochromatic light of wavelength $\lambda$ is kept at a distance $r$ from a photosensitive surface of work function $\phi$ and surface  area $A$, we will have wrong option :-
→
Under isothermal condition, the pressure of a gas is given by $P = aV ^{-3}$, where $a$ is a constant and $V$ is the volume of the gas. The bulk modulus at constant temperature is equal to $..........\,P$
→
An electron is moving along $+x$ direction with a velocity of $6 \times 10^{6}\, ms ^{-1}$. It enters a region of uniform electric field of $300 \,V / cm$ pointing along $+ y$ direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the $x$ direction will be
→
The equation $\lambda=\frac{1.227}{ x } nm$ can be used to find the de-Brogli wavelength of an electron. In this equation $x$ stands for :

Where,$m =$ mass of electron

$P =$ momentum of electron

$K =$ Kinetic energy of electron

$V =$ Accelerating potential in volts for electron

→
A rigid lamina is rotating about an axis passing perpendicular to its plane through point $O$ as shown in figure. The angular velocity of point $B$ w.r.t $A$ is ....... $rad/s$.
→
In the circuit shown, the reading of the Ammeter is doubled after the switch is closed. Each resistor has a resistance $ = 1\,\Omega $ and the ideal cell has an $e.m.f. = 10\, V$. Then, the Ammeter has a coil resistance equal to ................ $\Omega$
→
With rise in temperature, the Young's modulus of elasticity
→