NEET Practice Questions

Q181.

A physical quantity of the dimensions of length that can be formed out of  $c, G,~\text{and}~\dfrac{e^2}{4\pi\varepsilon_0}$ is:
( $c$ is the velocity of light, $G$ is the universal constant of gravitation and $e$ is charge)

Q182. A student measured the diameter of a small steel ball using a screw gauge of least count $0.001$ cm. The main scale reading is $5$ mm and zero of circular scale division coincides with $25$ divisions above the reference level. If the screw gauge has a zero error of $-0.004$ cm, the correct diameter of the ball is:

Q183.

The main scale of a vernier calliper has $n$ divisions/cm. $n$ divisions of the vernier scale coincide with $(n-1)$ divisions of the main scale. The least count of the vernier calliper is:

Q184.

In an experiment, the percentage errors that occurred in the measurement of physical quantities $A,$ $B,$ $C,$ and $D$ are $1\%$ , $2\%$ , $3\%$ , and $4\%$  respectively. Then, the maximum percentage of error in the measurement of $X,$ where  $X=\frac{A^2 B^{\frac{1}{2}}}{C^{\frac{1}{3}} D^3}$ , will be:

Q185. The unit of thermal conductivity is:

Q186.

Time intervals measured by a clock give the following readings: 
$1.25~\text{s},~1.24~\text{s}, ~1.27~\text{s},~1.21~\text{s},~1.28~\text{s}.$  
What is the percentage relative error of the observations? 

Q187. The angle of $1’$ (minute of an arc) in radian is nearly equal to:

Q188.

Dimensions of stress are:

Q189.

The energy required to break one bond in DNA is  $10^{-20}~\text{J}$ . This value in eV is nearly: 

Q190. Taking into account the significant figures, what is the value of $(9.99~\text{m}-0.0099~\text{m})$ ?