MCQOPTIONS
Saved Bookmarks
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.
| 2051. |
Which of the following is not an electromagnetic wave? |
| A. | x rays |
| B. | Light |
| C. | ultrasonic waves |
| D. | thermal radiation |
| Answer» D. thermal radiation | |
| 2052. |
At what temperature can a superconductor be of great economic importance thereby saving lakhs of rupees? |
| A. | at very low temperatures |
| B. | the temperature at which a semiconductor becomes |
| C. | at normal temperature |
| D. | at extremely high temperatures |
| Answer» D. at extremely high temperatures | |
| 2053. |
The mass of the nucleus of an atom in the number of neutrons and protons present in it - |
| A. | is always more than |
| B. | always less than |
| C. | is always double |
| D. | is equal to |
| Answer» C. is always double | |
| 2054. |
What are the following particles in the nucleus of an atom? |
| A. | protons and neutrons |
| B. | electrons and alu particles |
| C. | proton and electron |
| D. | electron and neutron |
| Answer» B. electrons and alu particles | |
| 2055. |
A photoelectric cell converts? |
| A. | light energy into heat energy |
| B. | light energy into sound energy |
| C. | light energy into electrical energy |
| D. | electrical energy into light energy |
| Answer» D. electrical energy into light energy | |
| 2056. |
(D₂O) is the formula given by which scientist? |
| A. | Harold Urey |
| B. | by Kirchhoff |
| C. | By Pascal |
| D. | by Newton |
| Answer» B. by Kirchhoff | |
| 2057. |
Are protons in an atom? |
| A. | within the nucleus |
| B. | outside the nucleus |
| C. | in orbit |
| D. | in both the nucleus and the orbital |
| Answer» B. outside the nucleus | |
| 2058. |
Atomic number of an element. . . is the number of? |
| A. | neutrons in the nucleus |
| B. | electrons in the nucleus |
| C. | protons in the nucleus |
| D. | none of these |
| Answer» D. none of these | |
| 2059. |
How is heavy water (DO) used in a nuclear reactor? |
| A. | diluent |
| B. | coolant |
| C. | examiner |
| D. | Controller |
| Answer» B. coolant | |
| 2060. |
When X-rays are produced, . . . |
| A. | heat generated at the target |
| B. | Bright light is seen on target |
| C. | the target temperature remains constant |
| D. | heat is absorbed at the target |
| Answer» B. Bright light is seen on target | |
| 2061. |
Which of the following is used as a neutron controller in a nuclear reactor? |
| A. | heavy water |
| B. | graphite |
| C. | cadmium or boron |
| D. | aluminum |
| Answer» D. aluminum | |
| 2062. |
A freely hanging magnet stays forever? |
| A. | in east-north direction |
| B. | in the north-west direction |
| C. | in north-south direction |
| D. | in the south-west direction |
| Answer» D. in the south-west direction | |
| 2063. |
Which of the following principle works in an atomic bomb? |
| A. | nuclear fusion |
| B. | Nuclear fission |
| C. | Fleming's law |
| D. | photoelectric effect |
| Answer» C. Fleming's law | |
| 2064. |
By what can the penetrating power of X-rays be increased? |
| A. | By increasing the current in the fiber |
| B. | By reducing the potential difference between cathode and anode |
| C. | reducing the current in the filament |
| D. | By increasing the potential difference between the cathode and the anode |
| Answer» E. | |
| 2065. |
It is difficult to magnetize steel because its . . . |
| A. | being less magnetized |
| B. | Due to the high holding capacity |
| C. | because of the high density |
| D. | being more magnetized |
| Answer» C. because of the high density | |
| 2066. |
What is the angle of the axis of a freely hanging magnetic needle with the geographic axis? |
| A. | of 200 |
| B. | 160's |
| C. | 180's |
| D. | 150's |
| Answer» D. 150's | |
| 2067. |
What is the value of the angle of descent of the equator? |
| A. | 0 degree |
| B. | 90 degrees |
| C. | 180 degree |
| D. | 45 degree |
| Answer» B. 90 degrees | |
| 2068. |
Where is the attraction power of a magnet lowest? |
| A. | on both sides |
| B. | in the middle |
| C. | on the magnetic axis |
| D. | Everywhere is same. |
| Answer» C. on the magnetic axis | |
| 2069. |
The process by which a metal is made non-magnetic is called? |
| A. | Demagnetization |
| B. | degaussing |
| C. | Degrading |
| D. | degrading |
| Answer» B. degaussing | |
| 2070. |
How are temporary magnets made? |
| A. | of steel |
| B. | soft iron |
| C. | of copper |
| D. | of silver |
| Answer» C. of copper | |
| 2071. |
Which of the following is electromagnet? |
| A. | Nickel |
| B. | cobalt |
| C. | Chromium |
| D. | copper |
| Answer» E. | |
| 2072. |
Where are permanent magnets made? |
| A. | of steel |
| B. | soft iron |
| C. | of copper |
| D. | of aluminum |
| Answer» B. soft iron | |
| 2073. |
What is the value of the angle of dip at the poles? |
| A. | 0 degree |
| B. | 45 degree |
| C. | 60 degree |
| D. | 90 degrees |
| Answer» E. | |
| 2074. |
Can a magnetic material be demagnetized? |
| A. | hammering |
| B. | warm up |
| C. | both 1 and 2 |
| D. | none of these |
| Answer» D. none of these | |
| 2075. |
In which direction is the north pole of the Earth's magnet located? |
| A. | answer |
| B. | South |
| C. | East |
| D. | west |
| Answer» C. East | |
| 2076. |
What is the Curie temperature of iron? |
| A. | 450℃ |
| B. | 575℃ |
| C. | 635℃ |
| D. | 780℃ |
| Answer» D. 780℃ | |
| 2077. |
A stationary magnet always reflects? |
| A. | North - North and South - South |
| B. | North - South and South - North |
| C. | East - East and West - West |
| D. | none of these |
| Answer» B. North - South and South - North | |
| 2078. |
What are the innumerable tiny structures of atoms within ferromagnetic materials called? |
| A. | Esophagus |
| B. | Toroid |
| C. | Domain |
| D. | none of these |
| Answer» D. none of these | |
| 2079. |
What is the principle of transformer based on? |
| A. | on the principle of magnetic induction |
| B. | on the principle of electromagnetic induction |
| C. | on the principle of self-induction |
| D. | on the principle of mutual induction |
| Answer» E. | |
| 2080. |
If a magnet is divided into two parts, then . . |
| A. | The two parts become separate magnets. |
| B. | One part becomes a magnet and the other part becomes a non-magnet. |
| C. | One part becomes the North Pole and the other part becomes the South Pole. |
| D. | both parts become non-magnetic |
| Answer» B. One part becomes a magnet and the other part becomes a non-magnet. | |
| 2081. |
The angle made by a magnetic needle freely suspended at its center of gravity with the horizontal is called? |
| A. | bow angle |
| B. | Dikpat angle |
| C. | Horizontal angle |
| D. | none of these |
| Answer» B. Dikpat angle | |
| 2082. |
Where does the needle of a magnetic compass point? |
| A. | magnetic north |
| B. | magnetic south |
| C. | neither of the above |
| D. | magnetic north and magnetic south |
| Answer» E. | |
| 2083. |
Where is the force of attraction of a magnet greatest? |
| A. | on both sides |
| B. | in the middle |
| C. | on the magnetic axis |
| D. | Everywhere is same. |
| Answer» B. in the middle | |
| 2084. |
The slurry used in the extraction of copper from copper ore is |
| A. | silica |
| B. | limestone |
| C. | alumina |
| D. | quick lime |
| Answer» B. limestone | |
| 2085. |
Lines of force in a uniform magnetic field. . . . |
| A. | must converge |
| B. | must be divergent |
| C. | should intersect |
| D. | should be parallel to each other |
| Answer» E. | |
| 2086. |
A small screw of the clock has fallen on the ground, we use it to find it? |
| A. | thin plane mirror |
| B. | Convex lens |
| C. | thick plane mirror |
| D. | concave lens |
| Answer» C. thick plane mirror | |
| 2087. |
Electromagnets are made of soft iron, why? |
| A. | Due to low magnetic tendency and low permeability |
| B. | Due to high magnetic tendency and low holding capacity |
| C. | Due to greater magnetic tendency and higher holding capacity |
| D. | Due to low magnetic tendency and high holding capacity |
| Answer» D. Due to low magnetic tendency and high holding capacity | |
| 2088. |
Which of the following moving in a magnetic field cannot be deflected? |
| A. | proton |
| B. | cathode rays |
| C. | alpha particle |
| D. | neutron |
| Answer» E. | |
| 2089. |
The horizontal component of the earth's magnetic field at any place is equal to Bn and the vertical component of the result. What is the value of the total intensity of the Earth's magnetic field at that place? |
| A. | Bn |
| B. | 2Bn |
| C. | √2Bн |
| D. | Bн / 2 |
| Answer» D. Bн / 2 | |
| 2090. |
What is the Earth's magnetic field approximately? |
| A. | 1 Tesla |
| B. | 2 gauss |
| C. | 10⁴ Tesla |
| D. | 1 gauss |
| Answer» E. | |
| 2091. |
Have an endoscope? |
| A. | narrow visionary |
| B. | camera type |
| C. | simple microscope |
| D. | none of these |
| Answer» B. camera type | |
| 2092. |
A long current carrying coil is called? |
| A. | Esophagus |
| B. | Toroid |
| C. | Domain |
| D. | none of these |
| Answer» B. Toroid | |
| 2093. |
Which is not an example of electromagnetic wave? |
| A. | ultraviolet rays |
| B. | radio waves |
| C. | X-rays |
| D. | sound waves in air |
| Answer» E. | |
| 2094. |
With reference to the difference between the gravitational force from the electric and magnetic forces, which of the following statements is true? |
| A. | Gravitational force is stronger than the other two. |
| B. | Gravitational force is only attractive, whereas electric and magnetic forces are attractive and repulsive. |
| C. | The range of gravitational force is very small. |
| D. | The gravitational force is a long-range force, while the other two are short-range forces. |
| Answer» B. Gravitational force is only attractive, whereas electric and magnetic forces are attractive and repulsive. | |
| 2095. |
Which magnetic field is strongest? |
| A. | North Pole |
| B. | south pole |
| C. | at the poles |
| D. | at the center of the magnet |
| Answer» D. at the center of the magnet | |
| 2096. |
In which direction does a freely suspended magnetic needle point? |
| A. | east - west direction |
| B. | north-south direction |
| C. | north east direction |
| D. | north-west direction |
| Answer» C. north east direction | |
| 2097. |
Which of the following electromagnetic waves have the lowest frequency? |
| A. | Gamma rays ( Y-rays ) |
| B. | X - rays |
| C. | Micro waves |
| D. | Radio waves |
| Answer» E. | |
| 2098. |
Solids which conduct electricity at high temperature but not at minimum are called |
| A. | super conductor |
| B. | metallic conductor |
| C. | semiconductor |
| D. | insulator |
| Answer» D. insulator | |
| 2099. |
What is the main component of Compressed Natural Gas (CNG)? |
| A. | athene |
| B. | methane |
| C. | propane |
| D. | acetylene |
| Answer» C. propane | |
| 2100. |
Which of the following ions has the highest magnetic moment? |
| A. | Mn²⁺ |
| B. | Ti³⁺ |
| C. | SC³⁺ |
| D. | Zn²⁺ |
| Answer» B. Ti³⁺ | |