MCQ
A tachometer is a device to measure
  • A
    Speed of rotation
  • Gravitational pull
  • C
    Surface tension
  • D
    Tension in a spring

Answer

Correct option: B.
Gravitational pull
b
A tachometer is an instrument designed to measure the rotation speed of a shaft or disk. Tachometers generally measure rotations per minute $(RPM)$ though some models also serve as rate meters and/or totalizers.

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

Figure here shows the vertical cross section of a vessel filled with a liquid of density $\rho$. The normal thrust per unit area on the walls of the vessel at the point $P$, as shown, will be
A wire of length 2m is made from 10cm3 of copper. A force F is applied so that its length increases by 2mm. Another wire of length 8m is made from the same volume of copper. If the force F is applied to it, its length will increase by:
The force of gravitation is
On a foggy day, two drivers spot each other when $80\, m$ apart. They were travelling at $70\, km/h$ and $60\, km/h$. Both apply brakes simultaneously which retard the cars at the rate of $5\, ms^{-2}$. Which of the following statements is correct ?
The displacement of a particle in simple harmonic motion in one time period is:
  1. A
  2. 2A
  3. 4A
  4. zero.
A process can be reversible if
The spring balance $A$ reads $2\, kg$ with a block m suspended from it. $A $ balance $B$ reads $5 \,kg $ when a beaker filled with liquid is put on the pan of the balance. The two balances are now so arranged that the hanging mass is inside the liquid as shown in figure. In this situation
The figure given below shows the cooling curve of pure wax material after heating. It cools from $A$ to $B$ and solidifies along $BD$. If $L$ and $C$ are respective values of latent heat and the specific heat of the liquid wax, the ratio $L/C$ is
A gravitational field is present in a region and a mass is shifted from $A$ to $B$ through different paths as shown. If $W _1, W _2$ and $W _3$ represent the work done by the gravitational force along the respective paths, then
An object is taken $1.0\,km$ deep in sea. Density of sea $= 1.025 \times 10^3\,kg/m^3$ , Bulk modulus of object $= 1.6 \times 10^6\, KPa$ Find out percentage change in density of object....... $\%$