Radiocarbon is produced in the atmosphere as a result of
If the doors of a refrigerator are left open for a few hours, the room temperature will
Sudden fall in barometer is indication of
Choose the incorrect statement ?
Kilowatt-hour (KWH) is the unit of?
Which of the following statements is false ?
The sun is seen before the actual sunrise because of __________.
Of the following properties of a wave, the one that is independent of the other is its
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
If the earth is 1/4th of its present distance from the sun, the duration of the year would be
On a rainy day, small oil films on water show brilliant colours. This is due to
The weight of a body is the gravitational force exerted on it?
The most stable particle in Baryon group is
In order to derive the law of gravitation, Newton assume that the moon’s orbit is?
The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called
The weight of the body is given by?
The weight of a body in a frame of reference is equal and opposite to the force required to prevent it?
The spectrum of an oil flame is an example for _____.
A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid of specific gravity 1.5?
In the analysis of projectile motion, it is assumed that effect of air resistance is?
If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?
What is the reason to pivot the compass needle on a sharp pin?
Consider the following statements :
Hypermetropia is a defect of vision in which
1. a person cannot see the distant objects clearly.
2. a person cannot see the near objects clearly.
3. the near point of the eye gets shifted away from the normal position.
4. the far point of the eye gets shifted towards the eye.
Which of the statements given above are correct?
If the acceleration due to gravity of a planet is half the acceleration due to gravity of earth’s surface and radius of planet is half the radius of the earth, the mass of planet in terms of mass of earth is
The escape velocity from earth is 11.2 km per sec. If a body is to be projected in a direction making an angle 45° to the vertical, then the escape velocity is
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is