Test Details

Diversity in Living Organisms, Atoms and Molecules and 7 other Topics

Feb 02, 2:40 PM

40 minutes

Feb 02, 3:20 AM

40.0 marks

MCQ

20 questions

PRASHANT N PUROHIT

Achievers'Academy

Class Details

Maths

Science

Class 9th

Maths

Science

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Question Text

Question 1 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the acceleration?

Question 2 :
A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then what is the net accelerating force?

Question 3 :
Which of the following animals has minute pores called as ostia?

Question 9 :
Which of the following is true for an element? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic mass = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons.

Question 10 :
Rutherford’s 'alpha ($\alpha$) particles scattering experiment’ resulted in to discovery of _______.

Question 11 :
Which of the following scientist identified the 'Canal rays' in the structure of an atom ?

Question 12 :
Is it possible for the atom of an element to have one electron, one proton and no neutron. (Yes/No)

Question 13 :
Energy exists in nature in several forms such as kinetic energy, potential energy, heat energy, chemical energy etc. The sum of the kinetic and potential energies of an object is called its mechanical energy.

Question 14 :
A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of $4 ms^{–1}$ by applying a force. The trolley comes to rest after traversing a distance of 16 m. How much work is done on the trolley?

Question 15 :
The number of particles in 46 g of Na atoms are-

Question 17 :
A hammer of mass 500 g, moving at 50 $ms^{-1}$, strikes a nail. The nail stops the hammer in a very short time of 0.01 s. What is the force of the nail on the hammer?

Question 18 :
An object maintains its motion under the continuous application of an unbalanced force. Is that actually correct?

Question 19 :
Weed control methods also include mechanical removal. TRUE or FALSE ?

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