List of practice Questions

A spherical mirror and a thin spherical lens each have a focal length of \( -15 \, \text{cm} \). The nature of the mirror and lens will be:
If the radius of Earth shrinks by 4% and mass of Earth unchanged, then the value of acceleration due to gravity will be changed by:
A car of mass 2000 kg is moving with a velocity of 18 km/h. Work done to stop this car is:
A person travels towards North by 4 m and then turns to West and travels by 3 m. The distance and displacements from initial point are
Two equal forces of 300 Newton each acting at an angle of 60°, the resultant will be
Which contain maximum number of molecules?
Least count of vernier calipers is 0.01 cm. Measuring the length of an object reading of main scale is 2.7 cm and the fifth division of vernier scale coincide with any division of main scale. The length of object will be
Modulus of rigidity of a liquid is
The percentage of Calcium in CaCO\(_3\) is
Ammonia is commercially prepared by
A sphere of 150 kg is kept on frictionless surface. A bullet of 0.15 kg mass with velocity 200 m/sec strikes the sphere and stops. After collision the velocity of sphere will be
Zener diode is used as an
Electrical conductivity of a semiconductor
The material of permanent magnet has
Which of the following is not a nitrogenous fertilizer?
Balance the equation
\[ {}^9_4\text{Be} + {}^4_2\text{He} \rightarrow {}^6_12\text{C} + \cdots \]
Gobar gas contains mainly
Which one of the following is the standard for atomic mass?
The order of radius of the nucleus of an atom is
An aqueous solution of Ferric chloride is
Number of moles in 180 grams of water is
If velocity of light in air is \(3 \times 10^8\) m/s and that in water is \(2 \times 10^8\) m/s, then what would be the critical angle?
The number of neutrons in \(^{238}U\) is
Accepting the definition that an acid is a proton donor, the acid in the following reaction
\[ NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^- \] is
The metal which is found in the native state is