List of top Physics Questions

A block of mass \( m \) attached to one end of the vertical spring produces extension \( x \). If the block is pulled and released, the periodic time of oscillation is
The x, y components of vector \( \vec{P} \) have magnitudes 1 and 3 and the x, y components of resultant of \( \vec{P} \) and \( \vec{Q} \) have magnitudes 5 and 6 respectively. What is the magnitude of \( \vec{Q} \)?
Refractive index of the medium is \( \mu \) and wavelength is \( \lambda \), then which of the following proportionality relation is correct?
The ratio of energy required to raise a satellite of mass \( m \) to a height \( h \) above the earth's surface to that required to put it into the orbit at same height is
In communication system, a repeater is used to extend the range of transmission. It is the combination of
The length of solenoid is \( \ell \) whose windings are made of material of density \( D \) and resistivity \( Q \). The winding resistance is \( R \). The inductance of solenoid is
Five capacitors each of capacity \( C \) are connected as shown in the figure. If their resultant capacity is 2\mu F, then the capacity of each condenser is
Two wires of different materials have same length \( L \) and same diameter \( d \). The second wire is connected at the end of the first wire and forms one single wire of double the length. This wire is subjected to stretching force \( F \) to produce the elongation \( \Delta L \). The two wires have
A circular coil of radius \( R \) is carrying a current \( I_1 \) in anticlockwise sense. A long straight wire is carrying current \( I_2 \) in the negative direction of x-axis. Both are placed in the same plane and the distance between the centre of coil and straight wire is \( d \). The magnetic field at the centre of coil will be zero for the value of \( d \) equal to
An obstacle is moving towards the source with velocity \( v \). The sound is reflected from the obstacle. If \( c \) is the speed of sound and \( \lambda \) is the wavelength, then the wavelength of the reflected wave \( \lambda_r \) is
A sonometer wire under suitable tension having specific gravity \( Q \), vibrates with frequency \( n \) in air. If the load is completely immersed in water the frequency of vibration of the wire will become
There are four convex lenses \( L_1 \), \( L_2 \), \( L_3 \), and \( L_4 \) of focal length 2, 4, 6, and 8 cm respectively. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively
A radioactive nucleus emits \( \alpha \) particles and \( \beta \) particles in succession. The ratio of number of neutrons to that of protons is \( A = \) mass number, \( Z = \) atomic number
A diatomic gas undergoes adiabatic change. Its pressure \( P \) and temperature \( T \) are related as \( P \propto T^x \), where \( x \) is
A ray of light travelling through glass of refractive index \( \sqrt{2} \) is incident on glass-air boundary at an angle of incidence 45°. If refractive index of air is 1, then the angle of refraction will be
An open organ pipe and a closed organ pipe have the frequency of their first overtone identical. The ratio of length of open pipe to that of closed pipe is
A step-up transformer has 300 turns of primary winding and 450 turns of secondary winding. A primary is connected to 150 volt and the current flowing through it is 9A. The current and voltage in the secondary are
A spherical rubber balloon carries a charge, uniformly distributed over the surface. As the balloon is blown up and increases in size, the total electric flux coming out of the surface
An \( \alpha \) particle of energy 10 eV is moving in a circular path in a uniform magnetic field. The energy of proton moving in the same path and same magnetic field will be [mass of \( \alpha \) particle = 4 times mass of proton]
In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter so formed is
Which of the following instruments is \textit{NOT} a direct reading instrument?
At absolute zero temperature, pure silicon behaves as
A transistor has a voltage gain \( A \). If the amount \( \beta A \) of its output is applied to the input of the transistor, then the transistor becomes oscillator when
A light wave of wavelength \( \lambda \) is incident on a slit of width \( d \). The resulting diffraction pattern is observed on a screen at a distance \( D \). If linear width of the principal maxima is equal to the width of the slit, then the distance \( D \) is
A simple pendulum of length \( \ell \) has a bob of mass \( m \). It executes S.H.M. of small amplitude \( A \). The maximum tension in the string is