Q. The forces acting on a drop of a liquid placed on a horizontal surface is -
1) Force due to surface tension
2) Force due to gravity
3) Both (A) and (B)
4) Force due to viscous
Q. Which one of the following types of glasses is used for making optical instruments?
1) Pyrex glass
2) Soft glass
3) Hard glass
4) Flint glass
Q. Joule-Thomson process is extremely useful and economical for attaining low temperature. The process can be categorized as -
1) isobaric process
2) isoenthalpic process
3) adiabatic process
4) isochoric process
Q. Ultrasonic waves are produced by making use of -
1) ferromagnetic material
2) ferrimagnetic material
3) piezoelectric material
4) pyroelectric material
Q. A person throws an object on a horizontal frictionless plane surface. It is noticed that there are two forces acting on this object-(i) gravitational pull and (ii) normal reaction of the surface. According to the third law of motion, the net resultant force is zero. Which one of the following can be said for the motion of the object ?
1) The object will move with acceleration
2) The object will move with deceleration
3) The object will move with constant speed, but varying direction
4) The object will move with constant velocity
Q. An electron and a proton starting from rest are accelerated through a potential difference of 1000 V. Which one of the following statements in this regard is correct?
1) The kinetic energy of both the particles will be different
2) The speed of the electron will be higher than that of the proton
3) The speed of the proton will be higher than that of the electron
4) The speed of the electron and the proton will be equal
Q. Two wires are made having same length/ and area of cross-section A. Wire 1 is made of copper and wire 2 is made of aluminium. It is given that the electrical conductivity of copper is more than that of aluminium. In this context, which one of the following statements is correct?
1) The resistance of wire 1 will be higher than that of wire 2
2) The resistance of wire 2 will be higher than that of wire 1
3) The resistance of both the wires will be the same
4) If same current is flown through both the wires, the power dissipated in both the wires will be the same
Q. Which one of the following elements is used as a timekeeper in atomic clocks ?
1) Potassium
2) Caesium
3) Calcium
4) Magnesium
Q. Why is argon gas used along with tungsten wire in an electric bulb ?
1) To increase the life of the bulb
2) To reduce the consumption of electricity
3) To make the emitted light colored
4) To reduce the cost of the bulb
Q. Sound waves cannot travel through a -
1) copper wire placed in air
2) silver slab placed in air
3) glass prism placed in water
4) wooden hollow pipe placed in vacuum
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