drehhcris16

The radius of curvature of a plane mirror is

(A) between one and eternal

(B) zero

(C) One

(D) Eternal

Which of the following statements are true for images formed by thin lenses?

1. A diverging lens always produces a virtual image of an object placed in front of it.

2. A diverging lens always produces an upright image of an object placed in front of it.

3. A converging lens always produces an inverted image of an object placed in front of it.

4. A converging lens always produces an image that is larger than the object.

5. A diverging lens always produces an image that is larger than the object.

6. A converging lens always produces a real image of an object placed in front of it.

Which of the following elements has lowest melting point? 

(A) Titanium

(B) Sulphur

(C) Argon

(D) Zinc

Which of the following is a non-magnetic material?

(A) Iron

(B) Nickel

(C) Brass

(D) None of these

Permanent magnets are made from _______________.

A. paramagentic materials

B. diamagnetic materials

C. ferromagnetic materials

D. dielectric matierals

Which statement is true of magnets?

a) Earth is an electromagnet

b) Electromagnets are weaker than permanant magnets

c) A magnet always has a north pole, and may or may not also has a south pole

d) A permanent magnet can be turned off.

Which best describes Earth’s magnetic field lines?

(a) The field lines go out of Earth near the South Pole, enter Earth in the North Pole, and are aligned with the geographic poles.

(b) The field lines go out of Earth near the South Pole, enter Earth in the North Pole, and are not aligned with the geographic poles.

(c) The field lines go out of Earth near the North Pole, enter Earth in the South Pole, and are aligned with the geographic poles.

(d) The field lines go out of Earth near the North Pole, enter Earth in the South Pole, and are not aligned with the geographic poles.

The figure shows a coil made of a wire wrapped around a cylindrical object. The coil is connected to the battery and a current flows in the wire. The current flows out of the + terminal and into the - terminal of the battery, making the coil an electromagnet. One end of the coil becomes a north pole and the other becomes a south pole. Use a right-hand rule to figure out which poles are on which sides of the coil.

a)The north pole is on the left and the south pole is on the right.

b)The north pole is on the right and the south pole is on the left.

c)Both ends are north poles.

d)Both ends are south poles.

 In which direction does the magnetic needlepoint?

(A) North

(B) Akash

(C) East

(D) None of these

Light year is a unit of which of the following physical sign?

(A) Short time interval

(B) mass

(C) Work

(D) distance

Acceleration is due to which of the following physical quantities?

a) Velocity

b) Speed

c) Energy

d) Momentum

e) Force

[A] Gujarat
[B] Rajasthan
[C] Punjab
[D] Baluchistan

Compute the discount if P2000 is discounted for 6 months at 8% simple interest

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1 Need some help

. The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, 151Eu with a mass of 151.0 amu and 153Eu with a mass of 153.0 amu. The natural abundance of the 131Eu isotope must be approximately a. 60%. b. 20%. c. 50%. d. 80%. e. 40%.

A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass of 78.9183 amu and a natural abundance of 50.69 %. The second isotope has a mass of 80.9163 amu. Find the atomic mass of the element.

81.25 amu

79.90 amu

79.54 amu

74.35 amu

How many moles of Ca are 3.01×10²³ atoms of calcium?

A) 1.81×10⁴⁷ mol

B) 0.500 mol

C) 1.00 mol

D) 3.01×10²³ mol

E) 3.01 mol

What is the crystalline type of the following solids?

a)  

b)  

c)

d)

e)  

Identify all possible types of intermolecular forces that can form between particles of each substance below. (Select all that apply.)

(a) CO₂

dipole-dipole interactions

hydrogen bonding interactions

ion-dipole interactions

London dispersion forces

(b) CHCl₃

dipole-dipole interactions

hydrogen bonding interactions

ion-dipole interactions

London dispersion forces

(c) Ne

dipole-dipole interactions

hydrogen bonding interactions

ion-dipole interactions

London dispersion forces

(d) NH₃

dipole-dipole interactions

hydrogen bonding interactions

ion-dipole interactions

London dispersion forces

(e) H₂S

dipole-dipole interactions

hydrogen bonding interactions

ion-dipole interactions

London dispersion forces

Match the following solids to their crystalline type:
CCl4: ___
CaBr2: ___
RbF: ___
Kr: ___
Ni: ___
1. nonbonding atomic
2. metallic atomic
3. ionic
4. molecular

Of the following oxides, ______ is the most acidic.

Classify these oxides as acidic, basic, amphoteric, or neutral. P4O10, At2O7, Al2O3, SnO2, MgO, Li2O, CO, NO. Begin by classifying the element (other than oxygen) in each oxide by where it appears on the periodic table. In general, oxides of elements further to the left on the periodic table are basic, moving toward acidic on the right. For nonmetallic oxides, when the oxidation number of the element other than oxygen is high, the oxide tends to be acidic. When the oxidation number of this element is low, the oxide is generally neutral

which element is present in all organic compounds

calcium and oxygen formula

Question 5

Let f  be a differentiable function with a domain of (0,5). It is known that  (x), the derivative of f(x), is negative on the intervals (0,1) and (2,3) and positive on the intervals (1,2) and (3,5). Which of the following statements is true?