An object is shot vertically upward. While it is rising 3.2 × 2.7 = The number of significant figures in 15.0 is The number of significant figures in 0.00150 is A gram is In sunlight, a rose appears red In green light, the same rose appears The hydraulic brakes used in automobiles is a direct application of In a refrigerator, the cooling system should always be Which physical quantity is measured in ‘siemens’ Tape recorder should not be kept near one of the following things An object at rest will remain at rest and an object in motion will remain in motion.until and unless it is acted upon by an external force. This is Newton's In the absence of ozone layer, Which rays will enter into atmosphere A spherical ball made of steel when dropped in mercury container will Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______ The fourth state of matter is known as Which among the following waves is used for communication by artificial satellites Water is not suitable as a calorimetric substance because it Minimum numbers of unequal vectors which can give zero resultant are Two rods, one of copper and other of steel, experience the same up thrust when placed in water. Thus, both have A device which is used to limit the current in an electrical circuit is called a The first model of atom was proposed by Water is flowing through a tube of non-uniform cross-section. Ratio of the radius at entry and exit end of the pipe is 3 : 2. Then the ratio of velocities at entry and exit of liquid is If you set up the seventh harmonic on a string fixed at both ends, how many nodes and antinodes are set up in it To break a wire of one meter length, minimum 40 kg wt. is required. Then the wire of the same material of double radius and 6 m length will require breaking weight The escape velocity of a body from the earth is u. What is the escape velocity from a planet whose mass and radius are twice those of the earth The diameter of rain-drop is 0.02 cm. If surface tension of water be 72 × 10-³ newton per meter, then the pressure difference of external and internal surfaces of the drop will be If the mean free path of atoms is doubled, then the pressure of gas will become Two bodies having same mass 20 kg are moving in opposite directions, one with a velocity of 10 m/s and the other with 5 m/s. If they collide and move as one body, the velocity of the combination is Which of the following is a self adjusting force A ball of mass 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse exerted on the ball is : <br>(Taking final velocity as positive) What is the unit of the physical quantity Inductance? Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre? An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is? In an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then? A capacitor of 30μF charged to 100V is connected in parallel to capacitor of 20μF charged to 50V. The common potential is? An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be? A convex lens acts as a diverging lens if the? Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is? A cup of milk is placed in a microwave oven. Tell which statements is false (1) Milk will be heated up only (2) Cup will remain cool (3) Both cup and mild will get hot? The projection of the particle moving in a circle with non-uniform speed executes? The product of frequency and time period is equal to? The force responsible for the vibratory motion of the simple pendulum is? The number 76.85 is rounded off upto two significant figures as? How many main frontiers of fundamental science? If electric resistance is to be decreased, then the number of resistances should be connected in………………? Which of the following Scientist proved that the path of each planet around the Sun is elliptical? The phenomenon which causes mirage is? Optic fibres are mainly used for which of the following ? Who discovered Penicillin? Which chemical element is represented by the symbol Zn? A moderator is used in nuclear reactors in order to? Mesons are found in? Which of the following terms is not used in the field of physics?