List of top Questions asked in OJEE

How far should an object be from a concave spherical mirror of radius 36 cm to form a real image one-ninth its size?
A wire 0.5 m long and with a mass per unit length of 0.0001 kg/m vibrates under a tension of 4 N. The fundamental frequency is:
If the speed of sound in air at 0°C is 331 m/s, the speed of sound in air at 35°C is:
Fog is a solution of:
Calculate the number density of free carriers in silver, assuming that each atom contributes one carrier. The density of silver is \( 10.5 \times 10^3 \, \text{kg/m}^3 \) and the atomic weight is 107.8.
A battery of 10 V and internal resistance 0.5 Ω is connected in parallel with a battery of 12 V and internal resistance 0.8 Ω. The terminals are connected by an external resistance of 20 Ω. The current flowing through the 20 Ω resistance is:
A coil has resistance 20 Ω and inductance 0.35 H. Compute its impedance to an alternating current of 25 cycles/s.
According to Henry’s Law, in gases, an increase in pressure increases:
Atomicity of oxygen in ozone molecule is:
The atoms of \(^ {6}C^{13}\) and \(^ {7}N^{14}\) are considered as:
Ar\(^ {18}_{40}\) and Ca\(^ {40}_{20}\) are considered as:
Atomicity of Phosphorus is:
Isotones are the atoms of different elements having:
Atomicity is given by:
Atomicity of an element is:
Avogadro’s hypothesis relates volume of gases and:
The compound which does not show a simple ratio of atoms is:
The Principle of Uncertainty was introduced by:
In the beginning of the 20th century, the matter wave concept was introduced by:
Atomicity of primary gases is:
Atoms of different elements with the same number of neutrons are called:
Atoms of different elements possessing the same atomic mass are called:
C\(^ {126}\) and C\(^ {14}\) are:
Isotopes are the atoms of the same element, with the same atomic number, but with different:
The Greek term ‘atomos’ means: