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Explore Class 11 Physics past and model questions by chapter, year, marks and question type.
26 questions found
At which temperature, a pure semiconductor behaves slightly as a conductor?
room temp
both low and room temp
high temp
low temp
In circuit shown below, the resistance are given in ohms and the battery is assumed ideal with emf equal to 3 volt. The voltage across the resistance R4 is:
1.2 V
0.6 V
0.4 V
1.5 V
An athlete makes a long jump and follows a projectile motion. Air resistance is negligible.
Which one of the following statements is true about the athlete?
The athlete has constant horizontal and vertical velocities.
The athlete has constant horizontal velocity and constant downward acceleration.
The athlete has constant upward acceleration followed by a constant downward acceleration.
The athlete has a constant upward velocity followed by a constant downward velocity.
At Kulekhani-I Hydro-power station, water flows from Indra Sarowar into the turbines that are a vertical distance of $550 \text{ m}$ below the lake, as shown in the diagram. Generally, $780,000 \text{ kg}$ of water flows into the turbines every minute. The turbines have the efficiency of $85%$. What is the output power of the turbines?
$71 \text{ MW}$
$60 \text{ MW}$
$4.2 \text{ GW}$
$3.6 \text{ GW}$
Graphs of stress-strain for four different materials are shown below. Which graph represents the stiffest material?
A boy walks towards a stationary plane mirror at a speed of $1.2 \text{ m s}^{-1}$. What is the relative speed of approach of the boy and his image?
$0$
$1.2 \text{ m s}^{-1}$
$2.4 \text{ m s}^{-1}$
$1.44 \text{ m s}^{-1}$
The critical angle between an equilateral prism and air is $45^\circ$. What happens to the incident ray perpendicular to the refracting surface?
It is reflected totally from the second surface and emerges perpendicular from the third surface.
It gets reflected from second and third surfaces and emerges from the first surface.
It keeps reflecting from all the three sides of the prism and never emerges out.
After deviation, it gets refracted from the second surface.
In the formation of a rainbow, the light from the sun on water droplets undergoes which of the following phenomenon/phenomena?
dispersion only
only total reflection
dispersion and total internal reflection
scattering
In what unit is the power of lens measured?
watt
metre
dioptre
Hertz
A piece of wire of resistance $R$ is bent through $180^\circ$ at mid-point and the two halves are twisted together. What is the resistance of the wire thus formed?
$R/4$
$R/2$
$R$
$2R$
What are the elementary particles with half spin called?
quarks
bosons
fermions
hadrons
State the law of conservation of momentum.
A jumbo jet of mass travelling at a speed of lands on the airport. It takes to come to rest. Calculate the average force applied by the ground on the aeroplane.
Forces are applied to a rigid body. The forces all act in the same plane. In which diagram is the body in equilibrium?
State Hooke’s law.
The walls of the tyres on a car are made of a rubber compound. The variation with stress of the strain of a specimen of this rubber compound is shown in Fig. As the car moves, the walls of the tyres bend and straighten continuously. Use Fig. to explain why the walls of the tyres become warm.
What is meant by specific latent heat of vaporization of water = $2.26 \text{ MJ kg}^{-1}$?
A $1.0 \text{ kW}$ kettle contains $500 \text{ g}$ of boiling water. Calculate the time needed to evaporate all the water in the kettle. (Specific latent heat of vaporization of water = $2.26 \text{ MJ kg}^{-1}$).
Explain why the actual time needed is a little longer than the time calculated in 2(b).
State any three properties of an ideal gas as assumed by the kinetic theory of gas.