Question 1

A lens of power +3.5 D is placed in contact with a lens of power -2.5 D. The combination will behave like a ____.
A) concave lens of 100 cm focal length
B) convex lens of 100 cm focal length
C) concave lens of 10 cm focal length
D) convex lens of 10 cm focal length

Question 2

____ is the screen on which light entering an eye, after refraction forms a real image.
A) iris
B) retina
C) pupil
D) cornea

Question 3

The electric current through a conductor is always equal to the potential difference (PD) across its ends.
A) True
B) False

Question 4

The change in magnetic flux linked with the coils A and B is same. If the time taken to bring this change in A is 0.5 s and in B is 0.75 s. The ratio of emfs induced in the coils A and B is ____.
A) 3 : 2
B) 2 : 3
C) 1 : 1
D) 2 : 1

Question 5

3MnO₂ + 4Al → 3Mn + 2Al₂O₃+ heat

The substance that is getting oxidised in this reaction is ____.

A) Al
B) MnO₂
C) Mn
D) Al₂O₃

Question 6

HCl, HNO₃ and H₂SO₄ are ____.
A) strong acids
B) strong bases
C) weak acids
D) weak bases

Question 7

IUPAC name of the compound CH₂Cl-CH₂-CH₂-COOH is ____.
A) 2-chloro butanoic acid
B) 3-chloro butanoic acid
C) 4-chloro butanoic acid
D) 1-chloro butanoic acid

Question 8

Which of the following is the correct order of the respiratory organs in human beings?
A) Nose, trachea, alveoli, bronchi and bronchioles
B) Nose, bronchioles, trachea, alveoli and bronchi
C) Nose, trachea, bronchi, bronchioles and alveoli
D) Nose, nostrils, bronchi, alveoli and bronchioles

Question 9

A) Shoots show positive phototropism and negative hydrotropism.
B) Roots show negative phototropism and positive hydrotropism.

A) Statement 'A' is incorrect and 'B' is correct.
B) Statement 'B' is incorrect and 'A' is correct.
C) Statement 'A' is correct and 'B' are incorrect.
D) Statement 'A' and 'B' are correct.

Question 10

The ability of an organism to produce a new individual from its body parts is called ____.
A) fission
B) budding
C) regeneration
D) fragmentation