MCQ
The vector projection of a vector $3\hat i + 4\hat k$ on $Y-$axis is
  • A
    $5$
  • B
    $4$
  • C
    $3$
  • $0$

Answer

Correct option: D.
$0$
d
(d)As the multiple of $\hat j$ in the given vector is zero therefore this vector lies in $XZ$ plane and projection of this vector on $Y-$axis is zero.

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

Similar questions

A body of mass $2\,kg$ makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body? $......... \mathrm{kg}$
A uniform rod $AB$ is suspended from a point $X$, at a variable distance from $x$ from $A$, as shown. To make the rod horizontal, a mass $m$ is suspended from its end $A$. A set of $(m, x)$ values is recorded. The appropriate variable that give a straight line, when plotted, are
A series LCR circuit with inductance $10\,H$, capacitance $10\,\mu F$, resistance $50\,\Omega$ is connected to an ac source of voltage, $V=200 \sin (100 t)$ volt. If the resonant frequency of the LCR circuit is $\nu_{0}$ and the frequency of the ac source is $v$, then:
Helium gas goes through a cycle $ABCDA$ ( consisting of two isochoric and isobaric lines) as shown in figure Efficiency of this cycle is nearly ....... $\%$ (Assume the gas to be close to ideal gas)
The least count of a stop watch is $\frac{1}{5}$ second. The time of $20$ oscillations of a pendulum is measured to be $25$ seconds. The maximum percentage error ig the measurement of time will be ..... $\%$
If two charges of $1$ coulomb each are placed $1 \,km$ apart, then the force between them will be ........... $N$
How much work does a pulling force of $40 \,N$ do on the $20\, kg$ box in pulling it $8 \,m $ across the floor at a constant speed. The pulling force is directed at $60^o $ above the horizontal.....$J$
Young’s moduli of two wires $A$ and $B$ are in the ratio $7 : 4$. Wire $A$ is $2\, m$ long and has radius $R$. Wire $A$ is $2\, m$ long and has radius $R$. Wire $B$ is $1.5\, m$ long and has radius $2\, mm$. If the two wires stretch by the same length for a given load, then the value of $R$ is close to ......... $mm$
Two closed organ pipes of length $100 \,cm$ and $101 \,cm$ $16$ beats in $20\, sec$. When each pipe is sounded in its fundamental mode calculate the velocity of sound .... $ms^{-1}$
Two cars $A$ and $B$ are travelling in the same direction with velocities ${v_1}$ and ${v_2}$$({v_1} > {v_2})$. When the car $A$ is at a distance $d$ ahead of the car $B$, the driver of the car $A$ applied the brake producing a uniform retardation $a$ There will be no collision when