Q1. Identify the normally radioactive material in the following list. Q1. Identify the normally radioactive material in the following list.
(A) Plutonium (A) Plutonium
(B) Germanium (B) Germanium
(C) Osmium (C) Osmium
(D) Cadmium (D) Cadmium
Answer: (A) Plutonium Answer: (A) Plutonium
Plutonium is the only radioactive element in the list.
Plutonium is a radioactive, silvery-gray, metallic element with the symbol Pu and atomic number 94. It has a high surface tension and viscosity compared to other metals, and tarnishes when exposed to air. Plutonium is created in a reactor when uranium atoms absorb neutrons, and is a by-product of nuclear power plants. It is the main fuel in fast neutron reactors, and more than one-third of the energy produced in most nuclear power plants comes from plutonium. Plutonium has five common isotopes, each with a different half-life, which is the time it takes to lose half of its radioactivityPlutonium is the only radioactive element in the list.
Plutonium is a radioactive, silvery-gray, metallic element with the symbol Pu and atomic number 94. It has a high surface tension and viscosity compared to other metals, and tarnishes when exposed to air. Plutonium is created in a reactor when uranium atoms absorb neutrons, and is a by-product of nuclear power plants. It is the main fuel in fast neutron reactors, and more than one-third of the energy produced in most nuclear power plants comes from plutonium. Plutonium has five common isotopes, each with a different half-life, which is the time it takes to lose half of its radioactivity
Q1. The science dealing with X-rays and other high-energy radiation, especially for the diagnosis and treatment of disease. Q1. The science dealing with X-rays and other high-energy radiation, especially for the diagnosis and treatment of disease.
What is one word substitution of the phrase?
What is one word substitution of the phrase?
(A) nephrology (A) nephrology
(B) neurology (B) neurology
(C) pathology (C) pathology
(D) radiology (D) radiology
Answer: (D) radiology Answer: (D) radiology
Substitute Word: radiology.
Radiology encompasses the medical use of imaging techniques such as X-rays, CT scans, MRI scans, Ultrasound, etc.Substitute Word: radiology.
Radiology encompasses the medical use of imaging techniques such as X-rays, CT scans, MRI scans, Ultrasound, etc.
Q2. Why the sky appears blue? Q2. Why the sky appears blue?
(A) Reflection of light (A) Reflection of light
(B) Refraction of light (B) Refraction of light
(C) Dispersion of light (C) Dispersion of light
(D) Diffraction of light (D) Diffraction of light
Answer: (C) Dispersion of light Answer: (C) Dispersion of light
Blue colour of the sky is due to dispersion or scattering of light. The two most common types of matter present in the atmosphere are gaseous nitrogen and oxygen. These particles are most effective in scattering the higher frequency and shorter wavelength portions of the visible light spectrum.Blue colour of the sky is due to dispersion or scattering of light. The two most common types of matter present in the atmosphere are gaseous nitrogen and oxygen. These particles are most effective in scattering the higher frequency and shorter wavelength portions of the visible light spectrum.
Q3. When is National Science Day celebrated? Q3. When is National Science Day celebrated?
(A) 26 August (A) 26 August
(B) 13 July (B) 13 July
(C) 26 February (C) 26 February
(D) 28 February (D) 28 February
Answer: (D) 28 February Answer: (D) 28 February
28 February,
National Science Day is celebrated in India on February 28th each year to mark the discovery of the Raman effect by Indian physicist Sir C. V. Raman on 28 February 1928.28 February,
National Science Day is celebrated in India on February 28th each year to mark the discovery of the Raman effect by Indian physicist Sir C. V. Raman on 28 February 1928.
Q5. Which are the planets in our solar system which do not have any natural satellite? Q5. Which are the planets in our solar system which do not have any natural satellite?
(A) Mercury and Mars (A) Mercury and Mars
(B) Venus and Mars (B) Venus and Mars
(C) Uranus and Mars (C) Uranus and Mars
(D) Mercury and Venus (D) Mercury and Venus
Answer: (D) Mercury and Venus Answer: (D) Mercury and Venus
Q7. Beyond what distance a normal eye can see objects clearly? Q7. Beyond what distance a normal eye can see objects clearly?
(A) 20 cm (A) 20 cm
(B) 30 cm (B) 30 cm
(C) 25 cm (C) 25 cm
(D) 35 cm (D) 35 cm
Answer: (C) 25 cm Answer: (C) 25 cm
For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 25 cm for a grown up person. A person can theoretically have clear vision of an object situated at any large distance from the eye.For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about 25 cm for a grown up person. A person can theoretically have clear vision of an object situated at any large distance from the eye.
Q8. Which is responsible for Earth's magnetic field? Q8. Which is responsible for Earth's magnetic field?
(A) Inner Core (A) Inner Core
(B) Outer Core (B) Outer Core
(C) Mantle (C) Mantle
(D) Crust (D) Crust
Answer: (B) Outer Core Answer: (B) Outer Core
Outer Core
The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.Outer Core
The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.
Q9. Who was the first woman to win the Nobel Prize in Physics? Q9. Who was the first woman to win the Nobel Prize in Physics?
(A) Marie Curie (A) Marie Curie
(B) Alva Myrdal (B) Alva Myrdal
(C) Jody Williams (C) Jody Williams
(D) Jane Addams (D) Jane Addams
Answer: (A) Marie Curie Answer: (A) Marie Curie
Marie Salomea Skłodowska–Curie
She was the first woman to win a Nobel Prize, the first person to win a Nobel Prize twice, and the only person to win a Nobel Prize in two scientific fields.
Marie won her 1st Nobel Prize in 1903 in Physics with her husband for their pioneering work developing the theory of "radioactivity" - a term she coined.
Marie won her 2nd Nobel Prize in 1911 in Chemistry for her discovery of the elements polonium and radium, using techniques she invented for isolating radioactive isotopes.Marie Salomea Skłodowska–Curie
She was the first woman to win a Nobel Prize, the first person to win a Nobel Prize twice, and the only person to win a Nobel Prize in two scientific fields.
Marie won her 1st Nobel Prize in 1903 in Physics with her husband for their pioneering work developing the theory of "radioactivity" - a term she coined.
Marie won her 2nd Nobel Prize in 1911 in Chemistry for her discovery of the elements polonium and radium, using techniques she invented for isolating radioactive isotopes.