NEET TEST SERIES 86 PHYSICS

1. The pitch and the number of circular Scale divisions in a screw gauge with least count 0.002 mm are respectively

a) 1mm and 100
b) 0.5 mm and 50
c) 1mm and 50
d) 0.5 mm and 100

2. One centimetre on the main scale of a vernier callipers is divided into 10 equal parts. If 10 divisions of vernier coincide with 8 small divisions of the main scale, the least count of vernier callipers is

a) 0.01 cm

b) 0.02 cm

c) 0.05 cm

d) 0.005 cm

3. The numerical ratio of displacement to distance for a moving object is

a) always less than 1
b) always equal to 1
c) always more than 1
d) equal to or less than 1

4. From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If TA and TB are their respective time of flights then A. From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If TA and TB are their respective time of flights then

a) T_A > T_B
b) T_A= T_B
c) T_A <  T_B
b) their time of flights depend on their masses.

5. Acceleration due to gravity

a) a scalar
b) a vector
c) a polar vector
d) a pseudo vector

6. Which one of the following statements is true?

a) A scalar quantity is the one that is conserved in a process
b) A scalar quantity is the one that can never take negative values
c) A scalar quantity is the one that does not vary from one point to another in space
d) A scalar quantity has the same value for observers with different orientation of the axes

7. No force is required for

a) an object moving in straight line with constant velocity
b) an object moving in circular motion
c) an object moving with constant acceleration
d) an object moving in elliptical path.

9. A planet goes round the sun three times as fast as the earth. If r_p and r_e are the radii of orbit of the planet and the earth respectively then

10. The value of coefficient of volume expansion of glycerine is 5 ×10^–4 K^–1. The fractional change in the density of glycerine for a rise of 40°C in its temperature is:

a) 0.020
b) 0.025
c) 0.010
d) 0.015

11. In a reversible cyclic process of a gaseous system

a) ΔQ =ΔU
b) ΔU =ΔW
c) ΔW = 0
d) ΔU = 0

12. A perfect gas at 27°C is heated at constant pressure so as to double its volume. The final temperature of the gas will be, close to

a) 327°C
b) 200°C
c) 54°C
d) 300°C

13. ABC is an equilateral triangle. Charges +q are placed at each corner as shown in fig. The electric intensity at centre O will be

14. Figure shows two hollow charged conductors A and B having same positive surface charge densities. B is placed inside A and does not touches it. On connecting them with a conductor

a) charge will flow from A to B
b) charge will flow from B to A
c) charge oscillates between A and B
d) no charge will flow.

15. A network of six identical capacitors, each of value C is made as shown in the figure. Equivalent capacitance between points A and B is

a) C/4
b) 3C/4
c) 4C/3
d) 3C

16. The electric resistance of a certain wire of iron is 𝑅. If its length and radius are both doubled, then

a) the resistance and the specific resistance, will both remain unchanged
b) the resistance will be doubled and the specific resistance will be halved
c) the resistance will be halved and the specific resistance will remain unchanged
d) the resistance will be halved and the specific resistance will be doubled

17. Maximum energy evolved during which of the following transition?

a) n = 1 to n = 2
b) n = 2 to n = 1
c) n = 2 to n = 6
d) n = 6 to n = 2

18. O₂ molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms

a) is not important because nuclear forces are short –ranged
b) is as important as electrostatic force for binding the two atoms
c) cancels the repulsive electrostatic force between the nuclei
d) is not important because oxygen nucleus have equal number of neutrons and protons

19. Which of the following statements are correct?
I. Nuclear density is a constant for all matter.
II. Nuclear density is around 2.3 × 1017 kg/m3.
II. Nuclear density is very large compared to ordinary matter.
IV. Mass of ordinary matter is mainly due to nucleus.

a) I, II and III
b) II and III
c) I and II
d) I, II, III and IV