Q1. Which one of the following statements is not true about cosmic rays?
(a) They have very high frequency.
(b) They have very high wavelength.
(c) They are made of highly energetic charged particles.
(d) They originate from the sun.
Q2. According to the modern theory of nature of light, the light has
(a) wave nature only
(b) particle nature only
(c) both wave and particle (dual) nature
(d) neither particle nature nor wave nature
Q3. When a sound wave goes from one medium to another, the quantity that remains unchanged is
Q4. Which of the following are true about speed of sound?
(i) Sound propagates through a medium at a finite speed.
(ii) The speed of sound decreases when we go from solid to gaseous state.
(iii) Speed of sound increases with increase in temp.
(a) only (i)
(b) (i) & (iii)
(c) (i), (ii) & (iii)
(d) (i) & (ii)
Q5. In the human body, the appendix is attached to
(a) the large intestine
(b) the small intestine
(c) the gall bladder
(d) the stomach
Q6. Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
(a) Hydrogen, oxygen, sodium
(b) Carbon, hydrogen, nitrogen
(c) Oxygen, calcium, phosphorus
(d) Carbon, hydrogen, potassium
Q7. The virus is
(a) protein and lipid
(b) nucleic acid and protein
(c) lipid and carbohydrate
Q8. Which of the following can be used for
removal of stains of rust on clothes?
(a) 1 and 2
(b) 2 only
(c) 3 and 4
(d) 1, 2, 3 and 4
Q9. Which of the following copper alloys is used for the manufacture of springs and suspension filaments in electrical instruments?
(b) Aluminium bronze
(c) German silver
(d) Phosphor bronze
Q10. Magnetic resonance imaging is based on the phenomenon of
(a) nuclear magnetic resonance
(b) electron spin resonance
(c) electron paramagnetic resonance
(d) diamagnetism of human tissues
Q11. Which of the following gas is necessary for the process of photosynthesis?
Q12. Plants which grow in saline soil are
Q13. Plants which grow on rocks are known as
Q14. Which of the following does not have a gall bladder ?
Q15. Which one of the following human organs is less susceptible to harmful radiations ?