NEET TEST SERIES 43 PHYSICS

1. A physic quantity x depends on quantities y and z such that x = Ay + BtanCz, where A, B and C are  constants. Which of the following do not have the same dimensions?

(a) x and B

(b) c and z^-1

(c) y and B/A

(d) x and A

2. The acceleration due to gravity SI unit can be written as

(a) N kg^-1         
(b) N kg           
(c) N m^-1          
(d) N m        

3. The dimensional formula of density of a substance can be written as

(a) [ML³ T]
(b) [ML^-3 T]
(c) [ML³ T⁰]
(d) [ML^-3 T⁰]

4. The SI unit of momentum is

(a) kg m s^-1
(b) kg m s^-2
(c) kg m² s^-1
(d) kg m² s

5. A particle of mass 0.5kg travels in a straight line with velocity v=ax^3/2where a=5m^-1/2s^-1. What is the work done by the net force during its displacement from x=0 to x=2m?

(a) 40 J              
(b) 45 J
(c) 90 J              
(d) 50 J

6. A box mass 2kg increases its speed from 3 ms^-1 to 7 ms^-1. What is the increase in kinetic energy?

(a) 4 J                
(b) 16 J
(c) 40 J              
(d) 32 J

7. A body of mass 2kg is being pushed horizontally on a rough surface by 10 N force for 6 m. Given that the friction between the box and the surface is 4 N, what is the work done by the net force on the box?

(a) 36 J               
(b) 16 J
(c). 40 J              
(d) 32 J

8. A force F=20+10y acts on a particle in y-direction where F is in Newton and y in meter. Work done by this force to move the particle from y=0 to y=1m is:

(a) 20 J               
(b) 30J
(c) 5J                 
(d) 25J

11. Which of the following statement is false?

a) ∆G = 0 at equilibrium state of a chemical reaction.

b) ∆S = 0 at equilibrium state of a chemical reaction.

c) ∆H ≠ 0 at equilibrium state of a chemical reaction.

d) A chemical reaction is in its most stable state at equilibrium.

12. If 1 : 3 (molar ratio) mixture of N₂ and H₂ yields 20% (by volume) of NH₃ at 30 atm, then the moles of N₂ converted into product at equilibrium will be

(a) 0.66              
(b) 0.22
(c) 0.33            
(d) 0.44

13. Given the value of K for the reaction
2NO₂ + O₂ ⇌ 2NO₂ ; K = 100
What is the value of K’ for the adjusted reaction ?
4NO + 2O₂ ⇌ 4NO₂ ; K’ = ?

(a) 100
(b) 600
(c) 1000        
(d) 10000

14. The  expression for the reactions CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) and N₂ (g) + 3H₂ (g) ⇌  2NH₃ (g) in terms of K_c are respectively

a) Kp = K_c (RT)^-2 and   = K_c R          
b) Kp = K_c RT  and = K_c (RT)^-2 
c) Kp = K_c and   = K_c RT
d) K_p = K_c RT and K_p = K_c

15. The value of equilibrium constant for the reaction, HI (g) ⇌ 1/2 H₂ (g) + 1/2 I₂ (g) is 8.0. The equilibrium constant of the reaction H₂ (g) + I₂ (g) ⇌ 2HI (g) will be

(a) 16                 
(b) 1/8
(c) 1/16             
(d) 1/64

16. K_P for 20% dissociation of 1 mole PCl₅ at equilibrium under total pressure of 1 atm is

(a) 0.041 atm²    
(b) 0.041 atm   
(c) 0.062 atm²  
(d) 0.062 atm

17. AB₃ (g) ⇌ AB₂ (g) + ½ B₂ (g). If the initial pressure of AB₃ (g) is 700 torr and total pressure is 800 torr. Calculate K_P

(a) 1.64             
(b) 2.85         
(c) 3.21              
(d) 4.26

18. A vessel of 1 L capacity containing 1 mole SO₂ is heated till a state of equilibrium is attained. 2 SO₃ (g) ⇌ 2SO₂ (g) + O₂ (g). At equilibrium, 0.6 mole of SO₂ had formed. The value of K_eq is?

(a) 0.68              
(b) 0.36                       
(c) 0.45              
(d) 0.18

19. The equilibrium constant at 298 K for a reaction A + B ⇌ C + D is 100. If the initial concentration of all the four species were 1 M each, then equilibrium concentration of D (in mol /L) will be?

(a) 2.46
(b) 4.12
(c) 1.81
(d) 3.25

20. In metal carbonyls, such as Ni(CO)₄, the bonding between the metal center and carbon monoxide involves:

a) Only σ-bonding through lone pair donation from the carbon atom.
b) Only π-backbonding from the metal to the CO ligand.
c) A combination of σ-bonding and π-backbonding.
d) Ionic bonding between the metal and CO.