Physics-
General
Easy
Question
The temperature of a liquid drops from 
to 361 K in 2 minutes. Find the time during which temperature of the liquid drops from 
to 
. Temperature of room is 
- 84 sec
- 72 sec
- 66 sec
- 60 sec
The correct answer is: 84 sec
= 70 KÞ 
Again 
Þ 
min = 
sec.
Related Questions to study
Physics-
The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is 1000K, then the temperature of colder body will be
The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is 1000K, then the temperature of colder body will be
Physics-General
Physics-
Two identical objects A and B are at temperatures TA and TB respectively. Both objects are placed in a room with perfectly absorbing walls maintained at temperatures T 
The objects A and B attain temperature T eventually which one of the following is correct statement
Two identical objects A and B are at temperatures TA and TB respectively. Both objects are placed in a room with perfectly absorbing walls maintained at temperatures T The objects A and B attain temperature T eventually which one of the following is correct statement
Physics-General
Physics-
An open knife edge of mass 'm' is dropped from a height 'h' on a wooden floor. If the blade penetrates upto the depth 'd' into the wood, the average resistance offered by the wood to the knife edge is
An open knife edge of mass 'm' is dropped from a height 'h' on a wooden floor. If the blade penetrates upto the depth 'd' into the wood, the average resistance offered by the wood to the knife edge is
Physics-General
Physics-
If 
and 
represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass m, find the correct relation between and
If and represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass m, find the correct relation between and
Physics-General
Physics-
A ball hits the floor and rebounds after inelastic collision. In this case
A ball hits the floor and rebounds after inelastic collision. In this case
Physics-General
Physics-
A ball is attached to a horizontal cord of length L whose other end is fixed a peg is located at a distance h (= 4L/5) directly below the point of attachment of the cord. What will be the speed of the ball when it reaches the top of its circular path about the peg?
A ball is attached to a horizontal cord of length L whose other end is fixed a peg is located at a distance h (= 4L/5) directly below the point of attachment of the cord. What will be the speed of the ball when it reaches the top of its circular path about the peg?
Physics-General
Physics-
An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km it blows a whistle, whose echo is heard by the driver after 5 sec. If speed of sound in air is 330 m/s, the speed of engine is
An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km it blows a whistle, whose echo is heard by the driver after 5 sec. If speed of sound in air is 330 m/s, the speed of engine is
Physics-General
Physics-
The number of beats produced per second by two vibrations: x1 =x0 sin 646pt and x2 = x0 sin 652 pt is
The number of beats produced per second by two vibrations: x1 =x0 sin 646pt and x2 = x0 sin 652 pt is
Physics-General
Physics-
An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h, and the enemy submarine at 70 km/h. The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5500 km/h. What is the frequency detected by the Indian submarine
An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h, and the enemy submarine at 70 km/h. The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5500 km/h. What is the frequency detected by the Indian submarine
Physics-General
Physics-
if speed is plotted against x-axis and kinetic energy against y –axis, then the graph obtained has a shape similar to that of
if speed is plotted against x-axis and kinetic energy against y –axis, then the graph obtained has a shape similar to that of
Physics-General
Physics-
Water is pouring down from a waterfall at eh rate of 75 kg s-1 on the blades of turbine. If the height of the fall be 100m, then the power delivered to the turbine is nearly.
Water is pouring down from a waterfall at eh rate of 75 kg s-1 on the blades of turbine. If the height of the fall be 100m, then the power delivered to the turbine is nearly.
Physics-General
Physics-
A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 :1 .The ratio of their respective nuclear sizes is
A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 :1 .The ratio of their respective nuclear sizes is
Physics-General
Physics-
A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is
A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is
Physics-General
Physics-
An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency 500 Hz. The frequency received by an observer standing stationary at the centre of the track is
An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency 500 Hz. The frequency received by an observer standing stationary at the centre of the track is
Physics-General
Physics-
The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points 1, 2 and 3 on the string 123
The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points 1, 2 and 3 on the string 123
Physics-General
