1. When a beta particle is emitted from the nucleus of an atom, then-
A. atomic number decreases by oneB. mass number decreases by oneC. atomic number increases by oneD. mass number increases by one
2. Equation of axis of parabola is- x2 = 8y
A. x = 0B. y = 0C. x = −2D. y = −2
3. What is the ratio of average velocity and most probable velocity of a gas?
A. 2: πB. 2: √πC. π: 2D. π: √2
4. What is the value of kinetic energy of one mole of helium gas at 27°C temperature?
A. 3500 JB. 3845 JC. 3650 JD. 3741 J Ek = f 2 nRT = 3 2 × 1 × 8.314 × 300 = 3741 J
5. Modulus of complex number is- 3 + √7i
A. 5B. 4C. 3D. 6 = √32 + (√7)2 = √9 + 7 = √16 = 4
6. Which plant has a floral stalk of cymose inflorescence?
A. TuberoseB. MustardC. PaddyD. China rose Which bacterium is used in producing vinegar?