Q. Which one of the following statements about glass is not correct?
1) Glass is often said to be a supercooled liquid
2) Glass has no definite melting point
3) Soda glass is harder than Pyrex glass
4) Boron is present in Pyrex glass
Q. Which one of the following compounds does not exhibit a different oxidation number of the same element?
1) Pb3O4
2) Fe3O4
3) Fe2O3
4) Mn3O4
Q. When a ball bounces off the ground, which of the following changes suddenly? (Assume no loss of energy to the floor)
1) Its speed
2) Its momentum
3) Its kinetic energy
4) Its potential energy
Q. Which one of the following statements regarding Ohm's law is not correct?
1) Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it.
2) A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference.
3) A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field.
4) All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong.
Q. In which of the following phenomena do heat waves travel along straight line with the speed of light?
1) Thermal conduction
2) Thermal convection
3) Thermal radiation
4) Both, thermal conduction and radiation
Q. Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement/s is/ are correct?
1. Chemical reactions happening in the system cannot change the velocity v of the center of mass of the object.
2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the center of mass of object.
Select the correct answer using the code given below -
1) 1 only
2) 2 only
3) Both 1 and 2
4) Neither 1 nor 2
Q. A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true?
1) The ring has higher kinetic energy
2) The disc has higher kinetic energy
3) The ring and the disc have the same kinetic energy
4) Kinetic energies of both the bodies are zero since they are not in linear motion
Q. Rebuilding trust the thrust of the meeting of -
1) FICCI annual meeting 2021
2) Confederation of Indian Industry Annual Meeting 2021
3) United Nations General Assembly 2021
4) World Economic Forum virtual meeting 2021
Q. National Voters' Day is observed on January 25 each year to mark -
1) The foundation day of the Election Commission
2) The commencement of the first session of Constituent Assembly
3) The voting to urban local bodies in British India
4) The formation of councils in provinces
Q. 2021's Subhash Chandra Bose Aapda Prabandhan Puraskar has been given to ........... in the Individual category.
1) Sudhanshu Mohanty
2) Kumar Munnan Singh
3) Dr. Rajendra Kumar Bhandari
4) P.K. Mohapatra
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