List of practice Questions

In the following OP-AMP circuit, 𝑣𝑖𝑛 and 𝑣𝑜𝑢𝑡 represent the input and output signals, respectively.
OP-AMP circuit
Choose the correct statement(s):
When two spheres of radii $r$ and $\frac{r}{2}$ are brought in contact, the gravitational force of attraction between them is proportional to
In the measurement of length 6 $\mu$m is equal to $x$ pm. Then the value of $x$ is
If m and M denote the mean deviations about mean and about median respectively of the data 20, 5, 15, 2, 7, 3, 11, then the mean deviation about the mean of m and M is:
Given below are two statements:
Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance.
Statement II: In Polygenic inheritance, the effect of each allele is additive.
In the light of the above statements, choose the correct answer from the options given below.
A string of length \( L \) is fixed at both ends and vibrates in its fundamental mode. If the speed of waves on the string is \( v \), then the angular wave number of the standing wave is:
The maximum velocity of a fluid in a tube for which the flow remains streamlined is called its:

The general solution of the differential equation: \[ (6x^2 - 2xy - 18x + 3y) dx - (x^2 - 3x) dy = 0 \] 

Let
\[ I(R) = \int_0^R e^{-R \sin x} \, dx, \quad R > 0. \]
Which of the following is correct?
\( F_2C = CF_2 \) is a monomer of:
10.0 gm \( \text{CaCO}_3 \) on heating gave 5.6 gm of \( \text{CaO} \) and 4.4 gm of \( \text{CO}_2 \), given data support the law of:
In which of the following compounds does the oxidation number of oxygen equal +2?
Hardness of water is due to the presence of:
Which of the following order of ionic radii is correctly represented?
Detergents are the salt of:
Among the following, which is an ionic hydride?
Real gas behaves like an ideal gas at:
Which catalyst is used in oxidizing \( NH_3 \) in Ostwald's process?
The rate of diffusion of a gas is \( r \) and its density is \( d \), then under similar conditions of pressure and temperature:
Hydrocarbon used for welding purposes is:
An example of thermosetting plastic is:
Equivalent weight of a dibasic acid is 12. Its molecular weight is:
In the following reaction: \[ SO_2 + 2H_2S \rightarrow 3S + 2H_2O \] Which of the following statements is correct?
Essential constituent of an amalgam is:
Which of the following types of drugs reduces fever?