Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Six identical cells of emf E and internal resistance r are connected in parallel, then the net emf and internal resistance of the combination will be
In parallel connection the current flows through each resistor is?
Consider the following statements and select the correct code:
Assertion (A): A piece of ice added to the drink cools it.
Reason (R): Ice takes latent heat from the drink for melting resulting in the cooling of the drink.
Rainbow is formed due to a combination of
Force of attraction between the molecules of different substances is called
It takes much longer to cook food in the hills than in the plains, because
The angle between centripetal acceleration and tangential acceleration is?
Above the surface of the earth if we go to distance equal to double the radius of the earth, the value of ‘g’ will become?
A magnetic needle of magnetic moment
6. 7 × 10–2 Am2 and moment of inertia
7. 5 × 10–6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is :
Food gets cooked faster in a pressure cooker because
Consider the following statements:
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statement(s) given above is/are correct?
Inside an aeroplane, flying at a high altitude,
The force which opposes the relative motion between different layers of liquid or gases is called
To attain maximum range, the projectile must be launched at an angle of?
Metal resistors that conduct in accordance with Ohm’s law are said to be?
The horizontal distance from the origin (x=O, y=O) to the point where the projectile returns (x = R, y=O) is called?
Consider the following statements:
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding of vehicles, police use the Doppler effect to reflected short radio waves.Which of these statements are correct?
The path followed by a projectile is called its?
The escape velocity from the earth’s surface is 11 km/sec. A certain planet has a radius twice that of the earth but its mean density is the same as that of the earth. The value of the escape velocity from this planet would be
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Radiocarbon is produced in the atmosphere as a result of
Which of the following statements is false ?
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
In which of the following industries is mica as a raw material?
A 20 cm length of a certain solution causes right handed rotation of 38°. A 30 cm length of another solution causes left handed rotation of 24°. The optical rotation caused by 30 cm length of a mixture of the above solutions in the volume ratio 1 : 2 is
A circular coil carrying a certain current produces a magnetic field Bo at its centre. The coil is now rewound so as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is
A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is ______.