MCQOPTIONS
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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2001. |
Bread is the best source? |
| A. | Carbohydrate |
| B. | protein |
| C. | fat |
| D. | minerals |
| Answer» B. protein | |
| 2002. |
Two elements which have different number of electrons but same mass number are called? |
| A. | isotopes |
| B. | isocratic |
| C. | Isosceles |
| D. | Samneutronic |
| Answer» C. Isosceles | |
| 2003. |
In nuclear fission, energy is released? |
| A. | as light |
| B. | as a heat |
| C. | as chemical energy |
| D. | as mechanical energy |
| Answer» D. as mechanical energy | |
| 2004. |
What acid is used in batteries? |
| A. | Acetic acid |
| B. | hydrochloric acid |
| C. | sulfuric acid |
| D. | nitric acid |
| Answer» D. nitric acid | |
| 2005. |
Which scientist explained that there are two types of fusion reactions on the Sun, the proton-proton-cycle and the carbon-nitrogen cycle? |
| A. | Einstein |
| B. | Rutherford |
| C. | by Fermi |
| D. | bethe |
| Answer» E. | |
| 2006. |
The phenomenon associated with the formation of a three-dimensional image by the interference of two light rays from a laser or any other coherent light source is called? |
| A. | optical photography |
| B. | X-ray photography |
| C. | radiation illustration |
| D. | holography |
| Answer» B. X-ray photography | |
| 2007. |
in isotope atoms. . . |
| A. | same number of protons |
| B. | same number of neutrons |
| C. | same number of nucleons |
| D. | all are true |
| Answer» B. same number of neutrons | |
| 2008. |
Hydrogen bomb is based on? |
| A. | on nuclear fusion |
| B. | thomson |
| C. | On radioactive disintegration |
| D. | on all these |
| Answer» B. thomson | |
| 2009. |
The age of the earth is determined by which of the following method? |
| A. | carbon dating method |
| B. | pure rare earth metals |
| C. | bio clock method |
| D. | inorganic polymer |
| Answer» D. inorganic polymer | |
| 2010. |
The newly invented high temperature superconductor is? |
| A. | alloys |
| B. | pure rare earth metals |
| C. | ceramic oxide |
| D. | inorganic polymer |
| Answer» E. | |
| 2011. |
Can stones be treated without surgery? |
| A. | By X-ray |
| B. | by pleuroscopy |
| C. | by laser |
| D. | by ultrasound |
| Answer» C. by laser | |
| 2012. |
The first nuclear reactor was built? |
| A. | Einstein |
| B. | Newton |
| C. | by rutherford |
| D. | by Fermi |
| Answer» E. | |
| 2013. |
What is the use of laser beam? |
| A. | in cancer therapy |
| B. | in cardiac medicine |
| C. | in eye medicine |
| D. | in kidney therapy |
| Answer» D. in kidney therapy | |
| 2014. |
What is a laser ray? |
| A. | only one color |
| B. | of two colors |
| C. | of seven colors |
| D. | none of these |
| Answer» C. of seven colors | |
| 2015. |
Which of the following is used as a coolant in the fast breeder test reactor at Kalpakkam? |
| A. | Carbon dioxide |
| B. | heavy water |
| C. | sea water |
| D. | molten sodium |
| Answer» B. heavy water | |
| 2016. |
X-rays cannot hit whom? |
| A. | wood |
| B. | bone |
| C. | Meat |
| D. | skin |
| Answer» C. Meat | |
| 2017. |
Ottohn discovered the atomic bomb on the basis of which of the following principles? |
| A. | Uranium fission |
| B. | Nuclear fission |
| C. | alpha radiation |
| D. | gamma radiation |
| Answer» C. alpha radiation | |
| 2018. |
Recently discovered hyperthermal superconductor is? |
| A. | pure rare earth metals |
| B. | Alloy |
| C. | ceramic oxide |
| D. | inorganic polymer |
| Answer» C. ceramic oxide | |
| 2019. |
Which metal is used as a semiconductor in transistors? |
| A. | copper |
| B. | germanium |
| C. | graphite |
| D. | silver |
| Answer» C. graphite | |
| 2020. |
Is it silicone? |
| A. | conductor |
| B. | semiconductor |
| C. | insulator |
| D. | none of these |
| Answer» C. insulator | |
| 2021. |
In a laser do all the atoms emit light waves? |
| A. | of the same shape |
| B. | of the same dimension |
| C. | of the same art (phase) |
| D. | all these |
| Answer» C. of the same art (phase) | |
| 2022. |
How do stars get their energy? |
| A. | as a result of nuclear combination |
| B. | by nuclear fission |
| C. | by chemical reaction |
| D. | by gravitational pull |
| Answer» B. by nuclear fission | |
| 2023. |
What is the principle of atomic bomb based on? |
| A. | on nuclear fusion |
| B. | on nuclear fission |
| C. | on both 1 and 2 above |
| D. | none of these |
| Answer» D. none of these | |
| 2024. |
What is the number of protons in the nucleus of a hydrogen atom? |
| A. | Zero |
| B. | One |
| C. | three |
| D. | Five |
| Answer» C. three | |
| 2025. |
Which element has the most isotopes? |
| A. | uranium |
| B. | radium |
| C. | hydrogen |
| D. | polonium |
| Answer» C. hydrogen | |
| 2026. |
Radioactive substances emit? |
| A. | alpha rays |
| B. | beta rays |
| C. | gamma rays |
| D. | all these |
| Answer» E. | |
| 2027. |
Which hormone is responsible for never flowering on a plant? |
| A. | Auxin |
| B. | Gibberellin |
| C. | cytokinins |
| D. | florijin |
| Answer» E. | |
| 2028. |
What is a nuclear reactor? |
| A. | Atomic bomb site |
| B. | heavy water pond |
| C. | U - emitter of 238 |
| D. | atomic furnace |
| Answer» C. U - emitter of 238 | |
| 2029. |
Which one of the following is essential in the construction of a nuclear reactor? |
| A. | cobalt |
| B. | Nickel |
| C. | Zirconium |
| D. | tungsten |
| Answer» D. tungsten | |
| 2030. |
radio carbon dating . . . used to find the age of? |
| A. | planets |
| B. | fossils |
| C. | babies |
| D. | rocks |
| Answer» C. babies | |
| 2031. |
Who takes the three dimensional picture? |
| A. | holography |
| B. | photography |
| C. | Photochromatic |
| D. | radiography |
| Answer» B. photography | |
| 2032. |
What is the size of the nucleus? |
| A. | 10⁻¹⁰ m |
| B. | 10⁻⁹ m |
| C. | 10⁻¹³ m |
| D. | 10⁻¹⁵ m |
| Answer» E. | |
| 2033. |
XeF₄ reacts with water to form? |
| A. | XeOF₄ |
| B. | XeOF₂ |
| C. | XeO₃ |
| D. | XeO₂F₂ |
| Answer» E. | |
| 2034. |
Where do stars get their energy? 1. By nuclear fusion 2 . Due to gravitational contraction 3. By chemical reaction 4. by nuclear fission |
| A. | 1 and 2 |
| B. | 1 , 2 and 3 |
| C. | 1 and 4 |
| D. | 2 and 4 |
| Answer» B. 1 , 2 and 3 | |
| 2035. |
Barium is fed to patients in a suitable form before which ray test of the stomach, because . . . |
| A. | Barium allows X rays to pass through the abdomen due to its transparency to X rays. |
| B. | The barium compound like magnesium sulfate helps to clean the stomach before the X-ray test. |
| C. | Barium is a good absorber of X-rays and helps to see the abdomen (compared to other areas) clearly in the picture. |
| D. | Barium salts are white in color and this helps to see the abdomen clearly as compared to other areas in the picture. |
| Answer» D. Barium salts are white in color and this helps to see the abdomen clearly as compared to other areas in the picture. | |
| 2036. |
Alloys made from lanthanide elements are called? |
| A. | Positive Metal |
| B. | Mitch Metal |
| C. | Brass |
| D. | नाइक्रोम ( Nichrome ) |
| Answer» C. Brass | |
| 2037. |
The difference between a nuclear reactor and an atomic bomb is that - |
| A. | There is no chain reaction in a nuclear reactor, whereas in an atomic bomb, there is. |
| B. | In a nuclear reactor, the chain reaction is controlled. |
| C. | The chain reaction in a nuclear reactor is not controlled. |
| D. | There is no chain reaction in an atomic bomb, whereas it occurs in a nuclear reactor. |
| Answer» C. The chain reaction in a nuclear reactor is not controlled. | |
| 2038. |
Why is nuclear fusion also called thermal nuclear reaction? |
| A. | Converts energy into heat for fusion. |
| B. | Fusion requires extremely high temperature conditions. |
| C. | Fusion reaction takes place in sunlight |
| D. | none of the above |
| Answer» C. Fusion reaction takes place in sunlight | |
| 2039. |
Doordarshan signals cannot be received after a certain distance, because . . . |
| A. | The signal is weak. |
| B. | Antenna is weak. |
| C. | Air absorbs signals. |
| D. | The surface of the earth is curved. |
| Answer» E. | |
| 2040. |
Television signals after a specified distance are usually t. V. are not accepted by the set, is the reason for this? |
| A. | signal loss |
| B. | weak receiver antenna |
| C. | absorption of signals in the air |
| D. | curvature of the earth |
| Answer» E. | |
| 2041. |
a T. V. Which one of the following is required to play the set? V. The remote control unit is used by? |
| A. | light waves |
| B. | sound waves |
| C. | Radio waves |
| D. | micro waves |
| Answer» E. | |
| 2042. |
Which of the following principle is used to produce minimum temperature? |
| A. | superconductivity |
| B. | Joule - Kelvin Effect |
| C. | thermoelectric effect |
| D. | Rhodhoshma demagnetization |
| Answer» B. Joule - Kelvin Effect | |
| 2043. |
How many neutrons are released when uranium is bombarded with neutrons? |
| A. | One |
| B. | Two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 2044. |
N - P - N transistors are better than P - P - N transistors because . . . |
| A. | are cheap |
| B. | They have less energy loss. |
| C. | more electrons flow |
| D. | Has the ability to tolerate more heat. |
| Answer» D. Has the ability to tolerate more heat. | |
| 2045. |
An alpha particle has two unit positive charges. Its mass is approximately equal to? |
| A. | of two protons |
| B. | one atom of helium |
| C. | The sum of the masses of two positrons and two neutrons is |
| D. | of two positrons because each positron has only positive charge |
| Answer» C. The sum of the masses of two positrons and two neutrons is | |
| 2046. |
A diode is a device that converts current into - |
| A. | allows to flow in one direction |
| B. | allows it to flow in both directions |
| C. | does not allow flow in any direction |
| D. | none of the above |
| Answer» B. allows it to flow in both directions | |
| 2047. |
Sources of renewable energy in the stars. . . . |
| A. | conversion of hydrogen to helium |
| B. | conversion of helium to hydrogen |
| C. | radioactive decay |
| D. | an excess of oxygen that aids in burning and produces energy |
| Answer» B. conversion of helium to hydrogen | |
| 2048. |
An isotope of an atomic nucleus is the nucleus in which . . . |
| A. | The number of neutrons is the same, but the number of protons is different. |
| B. | The number of protons is the same but the number of neutrons is different. |
| C. | The number of protons and neutrons is the same. |
| D. | Both protons and neutrons have different numbers. |
| Answer» C. The number of protons and neutrons is the same. | |
| 2049. |
Isotopes are atoms of the same element whose . . . |
| A. | The atomic weight is the same, but the atomic number is different. |
| B. | Atomic mass different but same atomic number |
| C. | both atomic weight and atomic number are same |
| D. | none of the above |
| Answer» C. both atomic weight and atomic number are same | |
| 2050. |
Whose conclusion is the mass-energy relationship? |
| A. | Quantum theory |
| B. | General principle of relativity |
| C. | field theory of energy |
| D. | Specific theory of relativity |
| Answer» C. field theory of energy | |